Smiles (5)
'smiles' is the definition.
('grin' can be a synonym of 'smile')
This is all the clue.
(Another definition for grins that I've seen is " Broad smiles".)
'smiles' is the definition.
(beaming is a kind of smiling)
This is the entire clue.
(Other definitions for beams that I've seen before include "Rays of light" , "Shines" , "Smiles; joists" , "Smiles broadly or sunnily" .)