The most common and most likely answer to this crossword clue is the 8 letter word POSITIVE
I've seen this crossword clue in The Daily Telegraph
P
O
S
I
T
I
V
E
More clues leading to the result POSITIVE
- Certain to be above zero
- Indicating the presence of a certain substance in concrete
- Definite sign of an increase
- Assume I have to be encouraging
- Confident attitude about current ITV broadcast
- Convinced it is more than zero
- Certain naval officers with sex appeal regularly in view
- Fully convinced, as result of development
- Certain kind of proof produced by a photographer
- Convinced setter’s after advance
Buddy explains!

The straight part
We know that "produced by a photographer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case produced by a photographer = positive.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does POSITIVE mean?
POSITIVE noun- A thing capable of being affirmed; something real or actual.
- A favourable point or characteristic.
- Something having a positive value in physics, such as an electric charge.
- (grammar) A degree of comparison of adjectives and adverbs.
- (grammar) An adjective or adverb in the positive degree.
- A positive image; one that displays true colors and shades, as opposed to a negative.
- The positive plate of a voltaic or electrolytic cell.
- A positive result of a test.
- Not negative or neutral.
- Formally laid down.
- Stated definitively and without qualification.
- Fully assured in opinion.
- Of number, greater than zero.
- Characterized by constructiveness or influence for the better.
- Overconfident, dogmatic.
- Actual, real, concrete, not theoretical or speculative.
- Having more protons than electrons.
- (grammar) Describing the primary sense of an adjective, adverb or noun; not comparative, superlative, augmentative nor diminutive.
- Derived from an object by itself; not dependent on changing circumstances or relations; absolute.
- Characterized by the existence or presence of distinguishing qualities or features, rather than by their absence.
- Characterized by the presence of features which support a hypothesis.
- Of a visual image, true to the original in light, shade and colour values.
- Favorable, desirable by those interested or invested in that which is being judged.
- Wholly what is expressed; colloquially downright, entire, outright.
- Optimistic.
- Electropositive
- Basic; metallic; not acid; opposed to negative, and said of metals, bases, and basic radicals.
- HIV positive.
- (New Age jargon) Good, desirable, healthful, pleasant, enjoyable; (often precedes 'energy', 'thought', 'feeling' or 'emotion').