Crossword Genius

Aha! Writer stocks trendy shop jars (3,5,5)

Ross

I believe the answer is:

the penny drops

I'm a little stuck... Click here to teach me more about this clue!

'stocks trendy shop jars' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'aha writer' is the wordplay.
I cannot really see how this works, but
'writer' could be 'pen' (something which writes) and 'pen' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for the penny drops that I've seen before include "Understanding finally dawns" , "Now I see it" , "Those sweets very cheap" , "Money falls" , "I understand" .)

I've seen this clue in the Sydney Morning Herald.
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