Nurse abandons joining up programme (7)
I believe the answer is:
listing
'programme' is the definition.
(thesaurus)
'nurse abandons joining up' is the wordplay.
'nurse' becomes 'en' (abbreviation for enrolled nurse).
'abandons' indicates named letters should be taken away.
'joining up' becomes 'enlisting' (I've seen this before).
'enlisting' with 'en' taken away is 'LISTING'.
(Other definitions for listing that I've seen before include "catalogue" , "Keeling over" , "Enumerating" , "Not going straight" .)