Crossword Genius

Missing the first biggest show (6)

Ross

I believe the answer is:

attest

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

'show' is the definition.
(attesting is a kind of showing)

'missing the first biggest' is the wordplay.
I cannot really understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
'first' could be 'a' and 'a' is located in the answer.
The remaining letters 'test' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for attest that I've seen before include "Declare to be true or genuine" , "Confirm to be true" , "Give testimony in a court of law" , "Bear witness, declare to be true" , "Certify or bear witness" .)

I've seen this clue in The Hindu.
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