Handiest of tube stations (4)

I believe the answer is:

best

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

'handiest of tube stations' is the definition.
I can't tell whether this defines the answer.

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

Can you help me to learn more?

(Other definitions for best that I've seen before include "The finest - worst" , "Optimal" , "Of the highest quality" , "erstwhile drummer" , "BOSOM] ?" .)

I've seen this clue in the Evening Standard.

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