14 across
Become
less
demanding
of
used
piano
(4,4)
Become less demanding of used piano (4,4)
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The definition is at the beginning of the clue.
How the clue works
The definition is Become less demanding, meaning to go soft or ease off. The wordplay is a charade of GONE (used, as in used up) followed by SOFT (the musical term piano), with "of" acting as a link.