Remove superfluous covering of corset (7)
I believe the answer is:
extract
'remove' is the definition.
(I know that extract is a more specific form of the action remove)
'superfluous covering of corset' is the wordplay.
'superfluous' becomes 'extra' (synonyms).
'covering of' suggests removing the centre (only the letters which cover the word).
'corset' with its middle removed is 'ct'.
'extra'+'ct'='EXTRACT'
(Other definitions for extract that I've seen before include "copy out" , "Draw out - distillation" , "Draw or pull out" , "Lift from book" , "Piece taken from a longer work" .)