Crossword Genius

One superior form of tin (4)

Ross

I believe the answer is:

unit

'one' is the definition.
(synonyms)

'superior form of tin' is the wordplay.
'superior' becomes 'u' (U can mean upper-class, as in U and non-U speech).
'form of' is an anagram indicator (the letters need to be in another 'form').
'tin' with letters rearranged gives 'nit'.
'u'+'nit'='UNIT'

(Other definitions for unit that I've seen before include "Kitchen element?" , "squad" , "Small military detachment" , "Kitchen fitting" , "Group that's part of a larger organisation" .)

I've seen this clue in the Evening Standard.
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