The most common and most likely answer to this crossword clue is the 5 letter word PHOTO
I've seen this crossword clue in The Guardian
P
H
O
T
O
More clues leading to the result PHOTO
- Short advert: for a second
- Picture with sound of enemy trail
- Petty Officer keeps burning picture
- Still keen to be hugged by sailor
- Snap phosphorus burning off
- Central spot to put up sexy picture
- Sort of finish picture
- Contents of portfolio updated with recently taken picture
- Top house design no use in picture
- Flower framing summery picture
Buddy explains!

The straight part
We know that "still" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case still = photo.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 PHOTO mean?
PHOTO noun- A photograph.
- A photo finish.
- To take a photograph of.