Visited and made an appeal to (6,2)

'visited' is the definition.
('call on' can be a synonym of 'visit')

'and made an appeal to' is the wordplay.
I cannot quite see how this works, but
'and' could be 'n' (common abbreviation for 'and') and 'n' is present in the answer.
'made' could be 'led' (leading is a kind of making) and 'led' is found in the answer.
'an' could be 'a' and 'a' is found within the answer.
'appeal' could be 'o' and 'o' 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?