Crossword Genius

Processed crude oil becomes more murky (8)

Ross

I believe the answer is:

cloudier

'more murky' is the definition.
('cloudy' can be a synonym of 'murky')

'processed crude oil' is the wordplay.
'processed' indicates an anagram.
'crude'+'oil'='crudeoil'
'crudeoil' is an anagram of 'CLOUDIER'.

'becomes' acts as a link.

(Other definitions for cloudier that I've seen before include "more dull" , "Less transparent or clear, liquid say" .)

I've seen this clue in The Telegraph.
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