State there may be ten in an adjustable seat (5)

I believe the answer is:

texas

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

'state there' is the definition.
'texas' can be an answer for 'state' (I've seen this before). I am not certain of the 'there' bit.

'ten in an adjustable seat' is the wordplay.
'ten' becomes 'X' (Roman numeral).
'in' is an insertion indicator.
'an adjustable' indicates an anagram.
'seat' anagrammed gives 'teas'.
'x' going inside 'teas' is 'TEXAS'.

'may be' acts as a link.

Can you help me to learn more?

(Other definitions for texas that I've seen before include "Breed of cattle -- non-Goths relax (anag)" , "11's favourite baseball team" , "Second-largest US state by area" , "American state, capital Austin" , "State of USA" .)

I've seen this clue in the Evening Standard.

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