The most common and most likely answer to this crossword clue is the 7 letter word OUTDRAW
I've seen this crossword clue in Independent
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More clues leading to the result OUTDRAW
Buddy explains!
The straight part
We know that "What the “fastest gun” could do/make a superior picture?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case what the “fastest gun” could do/make a superior picture? = outdraw.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 OUTDRAW mean?
OUTDRAW verb- To extract or draw out.
- (Wild West) To remove a gun from its holster, and fire it, faster than another.
- To attract a larger crowd than.
- To draw better than; to surpass in creating drawn artworks.