Stew, with seconds included, in popular place (3,4)
I believe the answer is:
hot spot
'popular place' is the definition.
(I've seen this before)
'stew with seconds included' is the wordplay.
'stew with' becomes 'hotpot' (I've seen this before. I am not sure about the 'with' bit.).
'seconds' becomes 's'.
'included' is an insertion indicator.
'hotpot' going around 's' is 'HOT SPOT'.
'in' acts as a link.
(Other definitions for hot spot that I've seen before include "Place of significant danger" , "Place of potential excitement or violence" , "Where danger lurks" , "potential scene of violence?" , "Popular nightclub" .)