Being a source of sauce during supper time (4)

I believe the answer is:

pert

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'being a source of sauce' is the definition.
I can't judge whether this definition defines the answer.

'during supper time' is the wordplay.
'during' says the answer is hidden in the clue.
'PERT' is hidden in the letters of 'supper time'.

Can you help me to learn more?

(Other definitions for pert that I've seen before include "Forward - saucy" , "Jaunty" , "Cheeky, saucy" , "Impudent, cheeky" , "Irreverent or saucy" .)

I've seen this clue in the Evening Standard.

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