It's used by one who does evening work (9,4)
I believe the answer is:
smoothing iron
'work' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'it's used by one who does evening' is the wordplay.
'it's used by' means one lot of letters go next to another.
'one who does' becomes 'iron' (I can't explain this - if you can you should give a lot more credence to this answer).
'evening' becomes 'smoothing' (I've seen this before).
'iron' after 'smoothing' is 'SMOOTHING-IRON'.
Can you help me to learn more?
(Other definitions for smoothing iron that I've seen before include "something pressing once" , "Old-fashioned pressing device" , "goose" .)