Expand integral needing brackets put back (7)
I believe the answer is:
enlarge
'expand' is the definition.
(I know that expand can be written as enlarge)
'integral needing brackets put back' is the wordplay.
'brackets' indicates the answer is hidden within the clue (the answer is contained or bracketed by the clue).
'put back' shows that the letters should be reversed in order.
'egralne' is hidden within 'integral needing'.
'egralne' back-to-front is 'ENLARGE'.
(Other definitions for enlarge that I've seen before include "Expatiate" , "Make big" , "Expand" , "Dilate" , "Gleaner (anag.)" .)