Finest of tube stations (4)

I believe the answer is:

best

'finest' is the definition.
(similar in meaning)

'of tube stations' is the wordplay.
'of' indicates a hidden word.
'BEST' can be found hidden inside 'tube stations'.

(Other definitions for best that I've seen before include "Optimal" , "Most suitably" , "Most excellent - late football star" , "Most excellent; outwit" , "Worst -- as good as can be" .)

I've seen this clue in the Evening Standard.

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