Most rough architects troubled about latest of designs (11)

I believe the answer is:

scratchiest

'most rough' is the definition.

'architects troubled about latest of designs' is the wordplay.
'troubled' indicates an anagram.
'about' is an insertion indicator.
'latest of' suggests the final letters.
The final letter of 'designs' is 's'.
'architects' is an anagram of 'scratchiet'.
'scratchiet' enclosing 's' is 'SCRATCHIEST'.

I've seen this clue in The Times.

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