One shooting fish? (7)
I believe the answer is:
snapper
This clue might be a double definition.
'one shooting' is the first definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'fish?' is the second definition.
(snapper is a kind of fish)
Can you help me to learn more?
(Other definitions for snapper that I've seen before include "Fish; photographer" , "sharp-toothed fish" , "Fish; marine turtle" , "(Often red) food fish" , "Person photographing" .)