Correct spades for one edging plot (7)
I believe the answer is:
subedit
'correct' is the definition.
(check work as a subeditor)
'spades for one edging plot' is the wordplay.
'spades for one' becomes 'suit' (spades is a playing card suit).
'edging' is an insertion indicator (some letters go round the edges of others).
'plot' becomes 'bed' (a plot of land).
'suit' enclosing 'bed' is 'SUBEDIT'.
(Other definitions for subedit that I've seen before include "Headline writer does" , "Work for daily" , "Correct copy" , "to work on newspaper" , "Work on paper" .)