It's best one goes to town (5)

I believe the answer is:

ideal

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'it's best' is the definition.
(similar in meaning)

'one goes to town' is the wordplay.
'one' becomes 'i' (Roman numeral).
'goes to' says to put letters next to each other.
'town' becomes 'deal' (I can't explain this - if you can you should believe this answer much more).
'i'+'deal'='IDEAL'

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(Other definitions for ideal that I've seen before include "Consummate" , "Model of ethical behaviour" , "Just the ticket" , "faultless" , "Standard to aim for" .)

I've seen this clue in the Evening Standard.

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