The whole of my half goes to a partner (4)
I believe the answer is:
ally
'a partner' is the definition.
(thesaurus)
'the whole of my half goes to' is the wordplay.
'the whole of' becomes 'all' (I've seen this in other clues).
'half' means to take half the letters.
'goes to' is a charade indicator (letters next to each other).
'my' halved is 'y'.
'all'+'y'='ALLY'
(Other definitions for ally that I've seen before include "Team up" , "Co-operating person or nation" , "mate" , "Band together" , "Collaborator, affiliate" .)