Lift outfit so it twirls (4)
I believe the answer is:
otis
'lift outfit' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'so it twirls' is the wordplay.
'twirls' indicates an anagram (I've seen 'twirling' mean this).
'so'+'it'='soit'
'soit' anagrammed gives 'OTIS'.
Can you help me to learn more?
(Other definitions for otis that I've seen before include "regretful lady" , "Lift man" , "US inventor" , "Company providing lifts" , "Place of worship; side part of head" .)