Passing idea for a moan (7)

I believe the answer is:

whimper

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'moan' is the definition.
(thesaurus)

'passing idea for a' is the wordplay.
'passing idea' becomes 'whim' (whim is a kind of idea. I am not sure about the 'passing' bit.).
'for a' becomes 'per' ('per' can mean 'for each' person or 'for a' person).
'whim'+'per'='WHIMPER'

Can you help me to learn more?

(Other definitions for whimper that I've seen before include "Cry feebly or plaintively" , "Sob" , "Complaint" , "Cry weakly or softly" , "Snivel" .)

I've seen this clue in The Times.

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