The bad influence of Cupid, in concealing love (7)

I believe the answer is:

erosion

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'the bad influence' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'cupid in concealing love' is the wordplay.
'cupid' becomes 'eros' (I've seen this before).
'concealing' means one lot of letters goes inside another.
'love' becomes 'o' (love means zero in tennis).
'in' placed around 'o' is 'ion'.
'eros'+'ion'='EROSION'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for erosion that I've seen before include "Action of wearing away" , "Gradual decline" , "A wearing away as of rock by water" , "The gradual wearing away by weather" , "being eaten away" .)

I've seen this clue in the Evening Standard.

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