Seafood primarily put in stew for popular nightclub (7)
I believe the answer is:
hotspot
'popular nightclub' is the definition.
(ie a hotspot for night life)
'seafood primarily put in stew' is the wordplay.
'seafood primarily' becomes 's' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'put in' means one lot of letters goes inside another.
'stew' becomes 'hotpot' (I've seen this before).
's' placed within 'hotpot' is 'HOTSPOT'.
'for' is the link.
Can you help me to learn more?
(Other definitions for hotspot that I've seen before include "busy area" , "Nightclub" .)