One of the family Grannie certainly embraces (5)
I believe the answer is:
niece
'one of the family' is the definition.
(I've seen this in another clue)
'grannie certainly embraces' is the wordplay.
'embraces' indicates the answer is hidden within the clue (I've seen 'embraced' mean this).
'NIECE' is hidden in the letters of 'grannie certainly'.
(Other definitions for niece that I've seen before include "[PRIEST'S] daughter?" , "Son's cousin" , "Brother's daughter" , "Kinswoman" , "Daughter of a sibling" .)