Maybe it's of British extraction (3)

I believe the answer is:

tis

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'maybe it's' is the definition.
I can't tell whether this definition defines the answer.

'of british extraction' is the wordplay.
'of' indicates a hidden word.
'TIS' is hidden in the letters of 'british extraction'.

Can you help me to learn more?

(Other definitions for tis that I've seen before include "McCourt work" , "I confirm the identity of" , "Sequel to "Angela's Ashes"" , "It is shortened" , "... the season to be jolly" .)

I've seen this clue in the Evening Standard.

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