9 across
Treatment
centre
hosted
by
Pamela
Anderson
(1,3,1)
Treatment centre hosted by Pamela Anderson (1,3,1)
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The definition is at the beginning of the clue.
How the clue works
Look at Treatment centre — that's your definition, the hospital Accident and Emergency department. The word "hosted by" is telling you the answer is hiding inside "Pamela And erson", and there it is, tucked away in plain sight.