Overhear a chemist admitting pain (7)

I believe the answer is:

earache

'pain' is the definition.
(earache is a kind of pain)

'overhear a chemist admitting' is the wordplay.
'admitting' says the answer is hidden in the clue (I've seen 'admits' mean this).
'EARACHE' is hidden within 'overhear a chemist'.

(Other definitions for earache that I've seen before include "Aural complaint" , "Incessant complaining" , "stabbing in vestibule?" , "Ace hare (anag.)" , "Pain in aural organ" .)

I've seen this clue in The Telegraph.

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