Crossword Genius

She isn't quite worthless (5)

Ross

I believe the answer is:

penny

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

'worthless' is the definition.
Both the definition and answer are adjectives. Perhaps there's an association between them I don't understand?

'she isn't quite' is the wordplay.
'she' becomes 'Pen'.
'isn't quite' becomes 'ny' (I can't justify this - if you can you should give a lot more credence to this answer).
'pen'+'ny'='PENNY'

Can you help me to learn more?

(Other definitions for penny that I've seen before include "Denarius" , "Little bit of 18" , "Coin spent by the desperate?" , "Bronze coin" , "Lancaster" .)

I've seen this clue in the Evening Standard.
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