Crossword Genius

Choose a chap something sour (7)

Ross

I believe the answer is:

pickles

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'something sour' is the definition.
I can't judge whether this definition defines the answer.

'choose a chap' is the wordplay.
'choose' becomes 'pick' (picking is a kind of choosing).
'a chap' becomes 'les' ().
'pick'+'les'='PICKLES'

Can you help me to learn more?

(Other definitions for pickles that I've seen before include "Preserves in vinegar or brine" , "Vegetables preserved in vinegar or brine" .)

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