Came up to scratch as a roundsman? (9,3,5)

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

'came up to scratch as' is the wordplay.
I cannot really understand how this works, but
'as' could be 'eg' ('as' and 'e.g.' can both mean for example) and 'eg' is present in the answer.
'up to' could be 'ere' (I've seen this in another clue) and 'ere' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?