Provide sample of body fluid in hospital (4)

I believe the answer is:

spit

'provide sample of body fluid' is the definition.

'in hospital' is the wordplay.
'in' indicates the answer is hidden within the clue.
'SPIT' can be found hidden inside 'hospital'.

(Other definitions for spit that I've seen before include "Narrow point of land projecting into the sea" , "little light rain" , "Slaver" , "nearly a foot deep" , "Expectorate on the tongue of sand" .)

I've seen this clue in The Times.

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