Grand children of Tom, say, shine? (7)
I believe the answer is:
glitter
'shine?' is the definition.
(synonyms)
'grand children of tom' is the wordplay.
I cannot really see how this works, but
'grand' could be 'g' (G is short for grand as in a thousand) and 'g' is present in the answer.
The remaining letters 'litter' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'say' acts as a link.
Can you help me to learn more?
(Other definitions for glitter that I've seen before include "addition to Christmas card" , "Sparkling decoration" , "Glisten, sparkle" , "Are bright" , "Showy decoration" .)