Child's play for amateur photographer (7)

I believe the answer is:

snapper

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'photographer' is the definition.
(I've seen this before)

'child's play for amateur' is the wordplay.
'child's play' becomes 'snap' (synonyms).
'for amateur' becomes 'per' (I can't explain this - if you can you should give a lot more credence to this answer).
'snap'+'per'='SNAPPER'

Can you help me to learn more?

(Other definitions for snapper that I've seen before include "Fish; marine turtle" , "(Often red) food fish" , "sharp-toothed fish" , "Person photographing" , "Fish; photographer" .)

I've seen this clue in The Independent.

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