Wind or gas in thermal? (3,3)
I believe the answer is:
hot air
I believe this is a triple definition!
'wind' is the first definition.
(thesaurus)
'or' acts as a link.
'gas' is the second definition.
(I've seen this in another clue)
'in' is a link.
'thermal?' is the third definition.
(thesaurus)
(Other definitions for hot air that I've seen before include "over the Sahara?" , "Gas" , "Bombast or balloon filler" , "Talking nonsense" , "is essential before the balloon goes up" .)