Question on papers is something to be chewed over (4)
I believe the answer is:
quid
'something to be chewed over' is the definition.
I can't judge whether this definition defines the answer.
'question on papers' is the wordplay.
'question' becomes 'qu' (abbreviation).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'papers' becomes 'ID' (identification papers).
'qu'+'id'='QUID'
'is' is the link.
Can you help me to learn more?
(Other definitions for quid that I've seen before include "Pound (sl.)" , "One fifth of a fiver" , "bit of bread" , "Bit of greens" , "100p (slang)" .)
