Puzzled man at home when the penny drops (3,6)

I believe the answer is:

aha moment

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'when the penny drops' is the definition.
I can't tell whether this defines the answer.

'puzzled man at home' is the wordplay.
'puzzled' indicates an anagram.
'man'+'at'+'home'='manathome'
'manathome' with letters rearranged gives 'AHA MOMENT'.

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(Other definitions for aha moment that I've seen before include "A crossword might give you one" , "when light dawned" , "epiphany" .)

I've seen this clue in The Guardian.

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