Edges of Selsey beach may be described thus (5)

I believe the answer is:

sandy

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But I can't explain it at all! Could you help me understand?

(Other definitions for sandy that I've seen before include "gritty" , "Like many beaches" , "Reddish (hair); like a good beach" , "Yellowish-brown; name" , "(Of hair)light yellowish brown" .)

I've seen this clue in The Times.

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