Crossword Genius

Picked note up in canteen before leaving (6)

Ross

I believe the answer is:

chosen

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

'up in canteen before leaving' is the definition.
I can't tell whether this defines the answer.

'picked note' is the wordplay.
'picked' becomes 'chose' (I've seen this before).
'note' becomes 'n' (abbreviation).
'chose'+'n'='CHOSEN'

Can you help me to learn more?

(Other definitions for chosen that I've seen before include "part of Asia once" , "If you're one of these few, you're very privileged" , "Elected, picked" , "'''Many are called, but few are ...'' (Bible) (6)'" , "Selected, preferred" .)

I've seen this clue in The Guardian.
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