Touching stove isn't funny! (7)
I believe the answer is:
against
'touching' is the definition.
(I've seen this before)
'stove isn't funny' is the wordplay.
'stove' becomes 'aga' (I've seen this before).
'funny' indicates an anagram.
'isnt' is an anagram of 'inst'.
'aga'+'inst'='AGAINST'
(Other definitions for against that I've seen before include "antagonistic" , "In contrast to; touching" , "Opposing" , "Disapproving of" , "Opposite to" .)