Crossword Genius

Worry about being disturbed as taxi lets gent in (11)

Ross

I think it could be either:

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11

11,5
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'gent in' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'worry about being disturbed as taxi lets' is the wordplay.
I cannot quite understand how this works, but
'about' could be 'a' (abbreviation in Chambers) and 'a' is found within the answer.
'being' could be 'ex' (ex is a kind of being) and 'ex' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for existential that I've seen is " Relating to living".)

I've seen this clue in The Guardian.
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