It sounds like a slight gain for Amos, for example (5,7)

'amos for example' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'it sounds like a slight gain for' is the wordplay.
I cannot quite see how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found in the answer.
'slight' could be 'minor' (I've seen this before) and 'minor' is found within the answer.
'for' could be 'pro' (as in being 'pro' something) and 'pro' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?