Hotpot not dry’s served up (4)
I believe the answer is:
stew
'hotpot' is the definition.
(I've seen this before)
'not dry's served up' is the wordplay.
'not dry' becomes 'wet' ('wet' is the opposite to 'dry').
'served' becomes 's' (this could be a standard abbreviation of which I'm unaware).
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'wet'+'s'='wets'
'wets' in reverse letter order is 'STEW'.
Can you help me to learn more?
(Other definitions for stew that I've seen before include "Cook (in one's own juices?)" , "Tight spot" , "Dish of meat and mixed vegetables" , "Get anxious" , "Cook by long slow simmering" .)