One responsible for numerous shootings? (15)
I believe the answer is:
cinematographer
'one' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'responsible for numerous shootings?' is the wordplay.
I cannot really understand how this works, but
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for cinematographer that I've seen before include "Possibly a "pic-generator"" , "Film-maker" , "Film maker" , "Pictures he makes" .)