Crossword Genius

Not the only sort of spectacles on the beach (6)

Ross

I believe the answer is:

pebble

I'm a little stuck... Click here to teach me more about this clue!

'beach' is the definition.
The answer and definition can be both natural objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for pebble that I've seen before include "Stone on beach" , "one of many on beach" , "Small fragment of rock" , "There are many on a stony beach" , "Small, round stone" .)

I've seen this clue in The Globe and Mail.
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