Crossword Genius

Called the shots with straight lines, on paper (5)

Ross

I believe the answer is:

ruled

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

'called the shots' is the definition.
(I've seen this in another clue)

'straight lines on paper' is the wordplay.
I cannot quite see how this works, but
'lines' could be 'l' (abbreviation as in lines of poetry) and 'l' is found within the answer.
The remaining letters 'rued' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'with' is the link.

Can you help me to learn more?

(Other definitions for ruled that I've seen before include "Reigned - lined - decided" , "Reigned or ordered" , "Exercised control over" , "Governed, used one's authority" , "Held the reins" .)

I've seen this clue in the Sydney Morning Herald.
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