Lift woolly to reveal ... (8)
I believe the answer is:
elevator
'lift' is the definition.
('elevator' can be a synonym of 'lift')
'woolly to reveal' is the wordplay.
'woolly' indicates an anagram (I've seen this in other clues).
'to'+'reveal'='toreveal'
'toreveal' anagrammed gives 'ELEVATOR'.
(Other definitions for elevator that I've seen before include "I go up" , "US lift" , "one that goes up and down" , "part of tail muscle" , "An American lift - going up?" .)