A top flipping Conservative's slow (8)
I believe the answer is:
dilatory
'slow' is the definition.
('dilatory' can be similar in meaning to 'slow')
'a top flipping conservative's' is the wordplay.
'top' becomes 'lid' (lid is a kind of top**).
'flipping' is a reversal indicator.
'conservative' becomes 'tory' (I've seen this before).
'a'+'lid'='alid'
'alid' written backwards gives 'dila'.
'dila'+'tory'='DILATORY'
(Other definitions for dilatory that I've seen before include "Tending towards procrastination" , "Slow to act about idolatry" , "Inclined to dawdle" , "intended to waste time" , "Slothful in idolatry" .)