Together, also being dealt with by hospital (4,2,4)
I believe the answer is:
hand in hand
'together' is the definition.
(thesaurus)
'also being dealt with by hospital' is the wordplay.
'also' becomes 'and' (I've seen this before).
'being dealt with' becomes 'inhand' (I've seen this before).
'by' is a charade indicator (letters next to each other).
'hospital' becomes 'h'.
'and'+'inhand'='andinhand'
'andinhand' put after 'h' is 'HAND IN HAND'.
(Other definitions for hand in hand that I've seen before include "Jointly" , "Give back all one's cards" , "What whist players have" , "together" .)