Australian captain previously against mean treatment for terribly old fellow (4,3)

'terribly old fellow' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'australian captain previously against mean treatment' is the wordplay.
I cannot really understand how this works, but
'australian' could be 'a' (common abbreviation) and 'a' is present in the answer.
'against' could be 'v' (abbreviation for 'versus') and 'v' is found within the answer.
an anagram of 'mean' is 'eman' which is present in the answer.
A single letter 'c' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'for' acts as a link.

Can you help me to learn more?