Grand family of babies sparkle (7)
I believe the answer is:
glitter
'sparkle' is the definition.
(I know that sparkle can be written as glitter)
'grand family of babies' is the wordplay.
I cannot quite see how this works, but
'grand' could be 'g' (G is short for grand as in a thousand) and 'g' is found within the answer.
'family' could be 'litter' (I've seen this before) and 'litter' is present in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for glitter that I've seen before include "Sparkle on cards" , "Decorative sparkle" , "Twinkle" , "Show some sparkle" , "Gleam" .)