Crossword Genius

City trader's unloaded fruit stalls they pick (9)

Ross

I believe the answer is:

plectrums

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

'trader's unloaded fruit stalls they pick' is the definition.
The definition suggests an adverb but the answer is not.

'city' is the wordplay.
I cannot really see how this works, but
'city' could be 'ec' (the City of London postcode) and 'ec' is present in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Independent.
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