Reason for dregs in coffee pot? (7)
I believe the answer is:
grounds
This clue could be a double definition.
'reason' is the first definition.
(grounds or justification for a particular action)
'dregs in coffee pot?' is the second definition.
'grounds' can be an answer for 'dregs' (synonyms). I'm unsure of the 'in coffee pot?' bit.
'for' is the link.
Can you help me to learn more?
(Other definitions for grounds that I've seen before include "Area of enclosed land around a building" , "justification" , "Reasons" , "Basis for belief" , "enclosure around house" .)