Crossword Genius

Who fits roofing for a woodlouse? (6)

Ross

I believe the answer is:

slater

I'm a little stuck... Click here to teach me more about this clue!

'for a woodlouse?' is the definition.
(synonyms)

'who fits roofing' is the wordplay.
I cannot really understand how this works, but
'roofing' could be 'slate' (I've seen this in another clue) and 'slate' is found within the answer.
A single letter 'r' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for slater that I've seen before include "Professional roof worker" , "High-up person" , "Roof-worker" , "Does one abuse" , "Man on top" .)

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