Collection made by Conservative supporting bid (9)
I believe the answer is:
offertory
'collection' is the definition.
(thesaurus)
'conservative supporting bid' is the wordplay.
'conservative' becomes 'tory' (I've seen this before).
'supporting' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'bid' becomes 'offer' ('offer' can be a synonym of 'bid').
'tory' put after 'offer' is 'OFFERTORY'.
'made by' acts as a link.
(Other definitions for offertory that I've seen before include "Fry to fore at this part of church ceremony" , "Donation" , "Something given" , "Money collected during church service" , "Church collection" .)