Tibetan girl? (3)

I believe the answer is:

bet

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

'girl?' is the definition.

'tibetan' is the wordplay.
'BET' is hidden within the letters.
But, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for bet that I've seen before include "Wager, back" , "Wager, speculate" , "'Stake, wager (3)'" , "Speculation" , "Wager, or the sum waged" .)

I've seen this clue in the Evening Standard.

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