9 across
Scrub
part
of
moustache
at
hairdresser
(5)
Scrub part of moustache at hairdresser (5)
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The definition is at the beginning of the clue.
How the clue works
The definition is Scrub — rough open land. "Part of" tells you the answer is hiding inside the phrase, and sure enough "moustache at hairdresser" has it tucked right in there.