Crossword Genius

Drop in to see a hand? (4)

Ross

I believe the answer is:

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'drop in' is the definition.
(I've seen this in another clue)

'see a hand?' is the wordplay.
'see' becomes 'C' (the word for the letter, according to Chambers).
'a hand?' becomes 'all' (I can't explain this - if you can you should give a lot more credence to this answer).
'c'+'all'='CALL'

'to' is the link.

Can you help me to learn more?

(Other definitions for call that I've seen before include "Pay a visit" , "Cry - summon" , "Visit; cry out" , "Telephone - give a name" , "Entitle" .)

I've seen this clue in the Evening Standard.
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