Recover about 150 before the end (7)
I believe the answer is:
reclaim
'recover' is the definition.
('reclaim' can be a synonym of 'recover')
'about 150 before the end' is the wordplay.
'about' becomes 're' (regarding**).
'r50' becomes 'cl' (roman numerals).
'before' says to put letters next to each other.
'the end' becomes 'aim' (aim is a kind of end).
're'+'cl'+'aim'='RECLAIM'
(Other definitions for reclaim that I've seen before include "Get back (eg from the sea)" , "recovery like this" , "Make (land) available for use" , "From sea, rescue" , "Recover (materials/land) for subsequent use" .)