Nurse in attendance (4)
I believe the answer is:
tend
'nurse' is the definition.
(tend can mean to nurse or look after)
'in attendance' is the wordplay.
'in' says the answer is hidden in the clue.
'TEND' is hidden within 'attendance'.
(Other definitions for tend that I've seen before include "Look after (a patient)" , "Look after (someone)" , "Be inclined - look after" , "lean in a certain direction" , "Go in a particular direction; look after" .)