Crossword Genius

She’s not worth much! (5)

Ross

I believe the answer is:

penny

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

'worth much' is the definition.
The answer and definition can be both quantities as well as being singular nouns.
Maybe there's a link between them I don't understand?

'she's not' is the wordplay.
'she' becomes 'pen'.
'not' becomes 'ny' (I can't justify this - if you can you should believe this answer much more).
'pen'+'ny'='PENNY'

Can you help me to learn more?

(Other definitions for penny that I've seen before include "Girl" , "One hundredth of a pound" , "Little bit of 18" , "Bronze coin" , "Denarius" .)

I've seen this clue in The Mirror.
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