One of two equal parts (4)
'one of two equal parts' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for half that I've seen before include "Fifty percent" , "little drink" , "Two of these to the pint" , "shared round" , "Fifty per cent" .)
'one of two equal parts' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for moiety that I've seen before include "One of two equal parts" , "Either of two" , "Part" , "Oy! Time for a half" , "Fair portion" .)