Former Enrolled Nurses only (4)
I believe the answer is:
mere
'only' is the definition.
(I've seen this in another clue)
'former enrolled nurses' is the wordplay.
'nurses' says the answer is hidden in the clue (nurse can mean holding closely).
'MERE' is hidden in the letters of 'former enrolled'.
(Other definitions for mere that I've seen before include "Former lake" , "Pure; lake" , "Lake, pond (poetic)" , "Nothing more than a small pond" , "of no significance" .)