Brigs, for example, that no man can serve (3-7)

'serve' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'brigs for example that no man' is the wordplay.
I cannot quite understand how this works, but
'example' could be 'as' (I've seen this in other clues) and 'as' is found in the answer.
'no' could be 'o' (resembles 0 - 'no' can mean 'zero') and 'o' is found in the answer.
'man' could be 'r' (abbreviation for rook, a chess piece or 'man') and 'r' is found in the answer.
This explanation may well be incorrect...

'can' is the link.

Can you help me to learn more?