Thoughtfulness seen in allowance set by Tory party (13)
I believe the answer is:
consideration
'thoughtfulness' is the definition.
('consideration' can be a synonym of 'thoughtfulness')
'allowance set by tory party' is the wordplay.
'allowance' becomes 'ration' (I've seen this before).
'set by' is a charade indicator (letters next to each other).
'tory' becomes 'con' (abbreviation for Conservative).
'party' becomes 'side' (I've seen this before**).
'con'+'side'='conside'
'ration' put after 'conside' is 'CONSIDERATION'.
'seen in' is the link.
(Other definitions for consideration that I've seen before include "Study" , "factor to be borne in mind" , "Kindness" , "Bearing in mind - payment" , "Reward; careful thought" .)