Crossword Genius

Main charity sent back something sparkling (6)

Ross

I believe the answer is:

diadem

'something sparkling' is the definition.

'main charity sent back' is the wordplay.
'main' becomes 'med' ('main' can mean the sea - eg Mediterranean or Med).
'charity' becomes 'aid' (eg foreign aid).
'sent back' shows that the letters should be reversed in order.
'med'+'aid'='medaid'
'medaid' backwards is 'DIADEM'.

(Other definitions for diadem that I've seen before include "A crowning glory" , "Crown or headband worn as symbol of sovereignty" , "Regal power" , "Ornamental jewelled headdress" , "Kingly crown" .)

I've seen this clue in The Times.
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