Supply nurse with what's owed (5)
I believe the answer is:
endue
'supply' is the definition.
(I've seen this before)
'nurse with what's owed' is the wordplay.
'nurse' becomes 'en' (abbreviation for enrolled nurse).
'with' means one lot of letters go next to another.
'what's owed' becomes 'due' ('due' can be a synonym of 'owed').
'en'+'due'='ENDUE'
(Other definitions for endue that I've seen before include "Supply or provide" , "Invest - provide" , "Make investment" , "Invest (something) with a quality or ability" , "Endow or crown with" .)