Roof worker alters design (6)

I believe the answer is:

slater

'roof worker' is the definition.
(I've seen this in another clue)

'alters design' is the wordplay.
'design' indicates anagramming the letters.
'alters' with letters rearranged gives 'SLATER'.

(Other definitions for slater that I've seen before include "Craftsman" , "Man on top" , "Layer of roof slabs" , "High-reaching worker perhaps" , "High-up person" .)

I've seen this clue in the Sydney Morning Herald.

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