Crossword Genius

Constant request for pin? (4)

Ross

I believe the answer is:

cask

'pin?' is the definition.
(pin can mean a type of cask)

'constant request' is the wordplay.
'constant' becomes 'c' (mathematical abbreviation).
'request' becomes 'ask' (to ask is to request something).
'c'+'ask'='CASK'

'for' acts as a link.

(Other definitions for cask that I've seen before include "Drink here" , "Keg" , "Wine vessel; sack (anag.)" , "Wine barrel" , "Beer container" .)

I've seen this clue in The Independent.
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