Large, aggressive turtle: one's taking photos? (7)
I believe the answer is:
snapper
This clue could be a double definition.
'large aggressive turtle' is the first definition.
'snapper' can be an answer for 'turtle' (snapper is a kind of turtle). I'm not sure about the 'large aggressive' bit.
'one's taking photos?' is the second definition.
(someone snapping photos)
Can you help me to learn more?
(Other definitions for snapper that I've seen before include "Fish; photographer" , "(Often red) food fish" , "Fish; marine turtle" , "sharp-toothed fish" , "Person photographing" .)