Crossword Genius

Pairs lots for separating (5)

Ross

I believe the answer is:

tunes

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

'pairs' is the definition.
Although both the answer and definition are verbs in their -s form, I don't understand how one could define the other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Another definition for tunes that I've seen is " Airs, melodies".)

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