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' indicates the answer is hidden within the clue.
'TEND' is hidden in the letters of '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" .)