Crossword Genius

Good composer in small rock group (6)

Ross

I believe the answer is:

gravel

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'small rock group' is the definition.
The definition and answer can be both substances as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'good composer' is the wordplay.
'good' becomes 'g' (abbreviation).
'composer' becomes 'Ravel' (Maurice Ravel).
'g'+'ravel'='GRAVEL'

'in' is the link.

Can you help me to learn more?

(Other definitions for gravel that I've seen before include "Mixture of small stones" , "bits of rock" , "Small fragments of rock" , "Stone mixture for paths" , "Rock fragments and pebbles" .)

I've seen this clue in The Sun.
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