Coarse stuff, race across Brighton beach, say? (10)

I believe the answer is:

pebbledash

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'across brighton beach say?' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'coarse stuff race' is the wordplay.
'coarse stuff' becomes 'pebble' (pebble is a kind of stuff. I am not sure about the 'coarse' bit.).
'race' becomes 'dash' (dashing is a kind of racing).
'pebble'+'dash'='PEBBLEDASH'

Can you help me to learn more?

(Another definition for pebbledash that I've seen is " Type of coating for exterior walls".)

I've seen this clue in The Times.

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