Crossword Genius

They rebuke people found on roofs (7)

Ross

I believe the answer is:

slaters

'they rebuke people' is the definition.
The definition suggests an adverb but the answer is not.

'found on roofs' is the wordplay.
'found' becomes 'r' (I can't justify this - if you can you should give a lot more credence to this answer).
'on' is an insertion indicator.
'roofs' becomes 'slates' (slating is a kind of roofing).
'r' put into 'slates' is 'SLATERS'.

(Another definition for slaters that I've seen is " They fix tiles".)

I've seen this clue in The Everyman puzzle in The Observer.
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