Crossword Genius

Tailless breed crossed with mongrels to make pointers (7)

Ross

I believe the answer is:

cursors

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

'pointers' is the definition.
(I know this)

'tailless breed crossed with mongrels' is the wordplay.
I cannot really see how this works, but
'mongrels' could be 'curs' ('cur' can be a synonym of 'mongrel') and 'curs' is found within the answer.
The remaining letters 'ors' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'to make' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.
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