A light unit in central Uxbridge (3)

I believe the answer is:

lux

'a light unit' is the definition.
(lux is a kind of light unit)

'in central uxbridge' is the wordplay.
'in' says the answer is hidden in the clue.
'LUX' is hidden in the letters of 'central uxbridge'.

(Another definition for lux that I've seen is " a little bright intensity".)

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