Crossword Genius

Watch nurse have a go (6)

Ross

I believe the answer is:

sentry

'watch' is the definition.
('sentry' can be a synonym of 'watch')

'nurse have a go' is the wordplay.
'nurse' becomes 'sen' (I've seen this before).
'have' is a charade indicator (letters next to each other).
'a go' becomes 'try' (I've seen this before).
'sen'+'try'='SENTRY'

(Other definitions for sentry that I've seen before include "Sentinel, watch" , "Sentinel, look-out" , "Lookout person" , "Look-out, guard" , "Military lookout" .)

I've seen this clue in The Telegraph.
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