Not too badly, when up to it physically (4,6)

'physically' is the definition.
I know nothing about this answer so I can't tell whether this works.

'not too badly when up to it' is the wordplay.
I cannot really see how this works, but
'not' could be 'no' (I've seen this in other clues) and 'no' is located in the answer.
'when' could be 'e' (I've seen this in other clues) and 'e' is located in the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?