Enlarged picture of someone important (3,4)
I believe the answer is:
big shot
'enlarged picture' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'someone important' is the wordplay.
I cannot really understand how this works, but
'someone' could be 'shot' (shot is a kind of someone) and 'shot' is found within the answer.
'important' could be 'big' (similar in meaning) and 'big' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'of' is the link.
Can you help me to learn more?
(Other definitions for big shot that I've seen before include "Important man with loud gun?" , "Informally, an important person - sounds loud" , "VIP, informally" , "Important influential person" , "Colloquially a very important person - quite noisy" .)