But such girls don't wear a lot too much! (5)

I believe the answer is:

cover

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

'but such girls don't wear a' is the definition.
I can't tell whether this definition defines the answer.

'lot too much' is the wordplay.
'lot' becomes 'c' ().
'too much' becomes 'over' (I've seen this before).
'c'+'over'='COVER'

Can you help me to learn more?

(Other definitions for cover that I've seen before include "Sit on - suffice for" , "the point of cricket" , "Overlay" , "Shroud" , "Disguise" .)

I've seen this clue in the Evening Standard.

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