Really sharpens ends of tool facing yard (8)
I believe the answer is:
honestly
'really' is the definition.
(I've seen this before)
'sharpens ends of tool facing yard' is the wordplay.
'sharpens' becomes 'hones' (honing is a kind of sharpening).
'ends of' means to remove the middle letters.
'facing' is a charade indicator (letters next to each other).
'yard' becomes 'y'.
'tool' with its centre taken out is 'tl'.
'hones'+'tl'+'y'='HONESTLY'
(Other definitions for honestly that I've seen before include "Fairly" , "Frankly -- that's outrageous!" , "In a just manner" , "No kidding!" , "How law-abiding people act" .)