Good getting young ones to shine (7)
I believe the answer is:
glitter
'to shine' is the definition.
('glitter' can be a synonym of 'shine')
'good getting young ones' is the wordplay.
'good' becomes 'g' (abbreviation).
'getting' means one lot of letters go next to another.
'young ones' becomes 'litter' (eg a litter of puppies).
'g'+'litter'='GLITTER'
(Other definitions for glitter that I've seen before include "Flashiness" , "Are bright" , "Showy decoration" , "Decorative sparkle" , "Twinkle" .)