In favour of dream stock (9)
I believe the answer is:
provision
'stock' is the definition.
(thesaurus)
'in favour of dream' is the wordplay.
'in favour of' becomes 'pro' (I've seen this before).
'dream' becomes 'vision' (I've seen this before).
'pro'+'vision'='PROVISION'
(Other definitions for provision that I've seen before include "Something supplied" , "Supply; condition" , "Catering" , "facilities" , "Keep supplied" .)