Common question for a wine server (4)
I believe the answer is:
cask
'a wine server' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'common question' is the wordplay.
'common' becomes 'c' (this could be a standard abbreviation which I don't know about).
'question' becomes 'ask' (asking a question).
'c'+'ask'='CASK'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for cask that I've seen before include "VAT?" , "Large barrel" , "Wine barrel" , "Measure" , "Keg" .)