Crossword Genius

Capable of doing only little and that of a poor standard (3,2,2,4)

Ross

I believe the answer is:

not up to much

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

'capable' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'doing only little and that of a poor standard' is the wordplay.
I cannot really understand how this works, but
'doing' could be 'upto' (as in 'what are you up to?') and 'upto' is found in the answer.
'little' could be 'notmuch' (synonyms) and 'notmuch' is located in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...

'of' acts as a link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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