On a hill, showed the way up to an accuser (7)

'an accuser' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'on a hill showed the way up' is the wordplay.
'on' means one lot of letters go next to another.
'hill' becomes 'tor' (tor is a kind of hill).
'showed the way' becomes 'led' (lead can mean to show someone the way).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'led' back-to-front is 'del'.
'a'+'tor'='ator'
'ator' put after 'del' is 'DELATOR'.

'to' acts as a link.

Can you help me to learn more?