Idiots accepting leader of Tories' qualities (6)
I believe the answer is:
Here is my best explanation:
'qualities' is the definition.
(asset is a kind of quality)
'idiots accepting leader of tories'' is the wordplay.
'idiots' becomes 'asses' (I've seen this before).
'accepting' is an insertion indicator.
'leader of' suggests taking the first letters.
The initial letter of 'tories' is 't'.
'asses' enclosing 't' is 'ASSETS'.