Crossword Genius

Dishevelled engineers put back more grating (7)

Ross

I believe the answer is:

rougher

'more grating' is the definition.
('rough' can be a synonym of 'grating')

'dishevelled engineers put back' is the wordplay.
'dishevelled' becomes 'rough' (rough can mean dishevelled or untidy).
'engineers' becomes 're' (Royal Engineers).
'put back' is a reversal indicator.
're' in reverse letter order is 'er'.
'rough'+'er'='ROUGHER'

(Other definitions for rougher that I've seen before include "Not so gentle" , "less well?" , "Less smooth" .)

I've seen this clue in The Guardian.
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