Crossword Genius

Overtime pay for a barman, potentially? (9)

Ross

I believe the answer is:

refresher

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

'overtime pay' is the definition.
The definition and answer can be both related to property as well as being singular nouns.
Maybe there's an association between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for refresher that I've seen before include "course of sorts" , "Type of course" , "This reinvigorates" , "drink" , "Top-up course" .)

I've seen this clue in The Times.
Want a hint initially instead of a full solution? Install my app