10 across
Music
enhancer,
provided
one’s
in
more
spacious
surroundings
(9)
Music enhancer, provided one’s in more spacious surroundings (9)
hints
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checks
0
hints
The definition is at the beginning of the clue.
How the clue works
The definition is Music enhancer. provided gives you IF, and one gives you I, and those two sit inside more spacious (AMPLER) — so IF and I slot into AMPLER to give you AMPL-IF-I-ER. (The 's in the clue is doing the work of linking "one" to "in".)