Daughter has diamonds to gamble (4)
I believe the answer is:
dice
'gamble' is the definition.
(dicing is a kind of gambling)
'daughter has diamonds' is the wordplay.
'daughter' becomes 'd'.
'has' is a charade indicator (letters next to each other).
'diamonds' becomes 'ice' (I've seen this before).
'd'+'ice'='DICE'
'to' is the link.
(Other definitions for dice that I've seen before include "Cubes used in gambling" , "Numbered cube(s)" , "Gambling pieces" , "Gambling items" , "Make into chips" .)