Rest while bar rustled up a tasty snack (5,7)

I believe the answer is:

welsh rarebit

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'snack' is the definition.
(I have seen 'Toasted snack ' mean 'welsh rarebit' so perhaps 'snack' could also mean 'welsh rarebit')

'rest while bar rustled up a tasty' is the wordplay.
'rest while bar' can be anagrammed to 'WELSH RAREBIT'.
Though, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for welsh rarebit that I've seen before include "Cheesy dish" , "cheesy meal" , "Toasted snack" , "Cheese on toast" .)

I've seen this clue in The Times.

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