Crossword Genius

A ruling that's not very clear (5,4)

Ross

I believe the answer is:

faint line

I'm a little stuck... Click here to teach me more about this clue!

'not very clear' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'a ruling' is the wordplay.
I cannot quite see how this works, but
'a' is present in the answer.
'ruling' could be 'in' (the ruling party is voted 'in') and 'in' is present in the answer.
This explanation may well be incorrect...

'that's' acts as a link.

Can you help me to learn more?

I've seen this clue in The Globe and Mail.
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