Hot air trap (5)
I believe the answer is:
mouth
I believe this clue is a double definition.
'hot air' is the first definition.
(thesaurus)
'trap' is the second definition.
(I've seen this before)
(Other definitions for mouth that I've seen before include "Sauce" , "River outlet" , "River part - conversation opener?" , "River ending" , "trap" .)