Payment of a fixed allowance by Conservative party (13)
I believe the answer is:
consideration
'payment' is the definition.
(thesaurus)
'a fixed allowance by conservative party' is the wordplay.
'a fixed allowance' becomes 'ration' (I've seen this before).
'by' says to put letters next to each other.
'conservative' becomes 'con' (I've seen this in other clues).
'party' becomes 'side' (I've seen this before**).
'con'+'side'='conside'
'ration' put after 'conside' is 'CONSIDERATION'.
'of' acts as a link.
(Other definitions for consideration that I've seen before include "Thoughtfulness - relevant factor" , "examination" , "Reward; careful thought" , "A motive" , "Bearing in mind - payment" .)