Bank's cash desk for VAT (4)
I believe the answer is:
cask
'vat' is the definition.
(thesaurus)
'bank's cash desk' is the wordplay.
I cannot really see how this works, but
'cash' could be 'c' and 'c' is present in the answer.
The remaining letters 'ask' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'for' is the link.
Can you help me to learn more?
(Other definitions for cask that I've seen before include "Cylinder for liquid" , "Liquor container" , "Wine vessel; sack (anag.)" , "Beer container" , "VAT?" .)