Geological term for beach wear possibly (7)

I believe the answer is:

erosion

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'wear possibly' is the definition.
'erosion' can be an answer for 'wear' (I've seen this before). I am unsure of the 'possibly' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for erosion that I've seen before include "The wearing away by weather 97)" , "dying away" , "Mechanical process of wearing something down" , "Abrasion" , "A wearing away as of rock by water" .)

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

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