Inclination to check back number for Bolshevik (8)
I believe the answer is:
leninist
'bolshevik' is the definition.
(I've seen this before)
'inclination to check back number' is the wordplay.
'inclination' becomes 'list' (list can mean to tilt, lean or incline).
'to check' is an insertion indicator (check can mean to restrain or block in).
'back' shows that the letters should be reversed in order.
'number' becomes 'nine' (nine is a kind of whole number).
'nine' back-to-front is 'enin'.
'list' placed around 'enin' is 'LENINIST'.
'for' acts as a link.
(Other definitions for leninist that I've seen before include "Bolshevik" , "Revolutionary" , "Red" , "left-wing, in a way" , "Type of Marxist" .)