Lifts tops from one's torso and reveals bust (9)

'lifts' is the definition.
('elevator' can be a synonym of 'lift')

'tops from one's torso and reveals bust' is the wordplay.
'tops from' indicates taking the first letters (I've seen 'top from' mean this).
'and' says to put letters next to each other.
'bust' indicates anagramming the letters.
The initial letters of 'ones torso' is 'ot'.
'ot'+'reveals'='otreveals'
'otreveals' is an anagram of 'ELEVATORS'.