15 across
Fee,
one
third
off
–
decrease?
(4)
Fee, one third off – decrease? (4)
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The definition is at the end of the clue.
How the clue works
The wordplay takes Fee and knocks off 'one third' – one of its three letters – to leave FE, which is the chemical symbol for iron. The definition decrease is a playful 'de-crease', since an iron removes the creases from clothes.