A nurse without time to be there (6)
I believe the answer is:
attend
'be there' is the definition.
(I've seen this before)
'a nurse without time' is the wordplay.
'nurse' becomes 'tend' (tend can mean to nurse or look after).
'without' means one lot of letters goes inside another ('without' can be similar in meaning to 'outside').
'time' becomes 't' (abbreviation).
'tend' enclosing 't' is 'ttend'.
'a'+'ttend'='ATTEND'
'to' is the link.
(Other definitions for attend that I've seen before include "Escort (someone)" , "Be present at, or accompany" , "take heed" , "visit" , "Follow" .)