Not in favour of something used for cooking in street (7)
I believe the answer is:
against
'not in favour of' is the definition.
(I've seen this before)
'something used for cooking in street' is the wordplay.
'something used for cooking' becomes 'aga' (I am not sure about this - if you are sure you should believe this answer much more).
'street' becomes 'st' (abbreviation).
'aga'+'in'+'st'='AGAINST'
Can you help me to learn more?
(Other definitions for against that I've seen before include "In conflict with" , "In disagreement with" , "In contrast to; touching" , "antagonistic" , "In opposition to" .)