Degree of social elevation in Lancaster Gate (5)

I believe the answer is:

caste

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'degree of social elevation' is the definition.
'caste' can be an answer for 'degree' (thesaurus). I am unsure of the 'of social elevation' bit.

'in lancaster gate' is the wordplay.
'in' indicates a hidden word.
'CASTE' is hidden within 'lancaster gate'.

Can you help me to learn more?

(Other definitions for caste that I've seen before include "Persons with class" , "Social station" , "Large, long-necked, wading bird" , "place in society" , "A sect (anag)" .)

I've seen this clue in the Evening Standard.

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