Crossword Genius

Number turning sour and heavy (7)

Ross

I believe the answer is:

onerous

'heavy' is the definition.
(similar in meaning)

'number turning sour' is the wordplay.
'number' becomes 'one' (one is a kind of whole number).
'turning' is an anagram indicator.
'sour' anagrammed gives 'rous'.
'one'+'rous'='ONEROUS'

'and' is the link.

(Other definitions for onerous that I've seen before include "Burdensome, heavy kind of duty" , "weight" , "Heavy, difficult to do or bear" , "Difficult, troublesome" , "Challenging" .)

I've seen this clue in The Mirror and The Daily Express.
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