Sells cheaper tenderloins (9)

I believe the answer is:

undercuts

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

This could be a double definition.

'sells' is the first definition.
(undercutting is a kind of selling)

'cheaper tenderloins' is the second definition.
'undercuts' can be an answer for 'tenderloins' ('undercut' can be a synonym of 'tenderloin'). I am unsure of the 'cheaper' bit.

Can you help me to learn more?

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

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