Shilling — another twenty needed for calamari? (5)
I believe the answer is:
squid
'for calamari?' is the definition.
('squid' can be a synonym of 'calamari')
'shilling another twenty' is the wordplay.
I cannot really understand how this works, but
'shilling' could be 's' (abbreviation e.g. Lsd - pounds, shillings, pence) and 's' is found in the answer.
The remaining letters 'quid' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'needed' is the link.
Can you help me to learn more?
(Other definitions for squid that I've seen before include "Catch" , "Calamari" , "Cephalopod mollusc" , "Marine cephalopod" , "Large cephalopod" .)