Crossword Genius

One going round hospital in pain (4)

Ross

I believe the answer is:

ache

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

'one going round hospital' is the wordplay.
'one' becomes 'ace' ('ace' can be a synonym of 'one').
'going round' is an insertion indicator.
'hospital' becomes 'h'.
'ace' going around 'h' is 'ACHE'.

'in' acts as a link.

(Other definitions for ache that I've seen before include "agony" , "Dull steady pain" , "Feel sore" , "Each (anag.)" , "suffering" .)

I've seen this clue in The Times.
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