Hit edges of hedgerow during approach (6)
I believe the answer is:
thwack
'hit' is the definition.
(I know that thwack is a more specific form of the action hit)
'edges of hedgerow during approach' is the wordplay.
'edges of' suggests removing the centre.
'during' is an insertion indicator.
'approach' becomes 'tack' (I've seen this in another clue).
'hedgerow' with its centre removed is 'hw'.
'hw' going inside 'tack' is 'THWACK'.
(Other definitions for thwack that I've seen before include "Beat with something flat" , "Hard-hitting report" , "Sound of a heavy blow" , "Hit hard" , "Sudden blow's" .)