Hot air produced by cobblers (8)
I believe the answer is:
nonsense
I believe this is a double definition.
'hot air' is the first definition.
(I've seen this before)
'cobblers' is the second definition.
(I've seen this before)
'produced by' acts as a link.
(Other definitions for nonsense that I've seen before include "Having no intelligible meaning" , "Baloney" , "double Dutch?" , "Claptrap, hogwash" , "Foolish behaviour" .)