Plant not out by hedge (7)
I believe the answer is:
install
'plant' is the definition.
'not out by hedge' is the wordplay.
'not out' becomes 'in' ('in' is the opposite to 'out').
'by' means one lot of letters go next to another.
'hedge' becomes 'stall' (both can mean to avoid giving an answer).
'in'+'stall'='INSTALL'
(Other definitions for install that I've seen before include "Put in place ready for use" , "Place in position, establish" , "Settle" , "Emplace" , "Station" .)