Manage turning to croon as a vocation (7)
I believe the answer is:
nursing
'a vocation' is the definition.
(I know that nursing is a type of health profession)
'manage turning to croon' is the wordplay.
'manage' becomes 'run' (both can mean to organise).
'turning' shows that the letters should be reversed in order.
'to croon' becomes 'sing' (I've seen this before).
'run' reversed gives 'nur'.
'nur'+'sing'='NURSING'
'as' acts as a link.
(Other definitions for nursing that I've seen before include "Patient care" , "Medical vocation" , "Feeding baby" , "Caring profession" , "Caring career" .)