Broken toes, small but extremely thick (8)

I believe the answer is:

obtusest

'extremely thick' is the definition.
(obtuse can mean stupid or thick)

'broken toes small but' is the wordplay.
'broken' is an anagram indicator.
'small' becomes 's' (abbreviation - e.g. clothes size).
'toes'+'s'+'but'='toessbut'
'toessbut' is an anagram of 'OBTUSEST'.

I've seen this clue in The Times.

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