Does it grow a lot too much? (6)

I believe the answer is:

clover

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'does it grow a' is the definition.
I can't tell whether this definition defines the answer.

'lot too much?' is the wordplay.
'lot' becomes 'cl' (I can't explain this - if you can you should believe this answer much more).
'too much?' becomes 'over' (I've seen this in other clues).
'cl'+'over'='CLOVER'

Can you help me to learn more?

(Other definitions for clover that I've seen before include "Attractive fodder plant" , "Green trefoil plant" , "Forage crop" , "Trifolium" , "Weed or forage plant (which it's good to be in)" .)

I've seen this clue in the Evening Standard.

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