This extremely artificial spread makes less fat (7)

I believe the answer is:

falsest

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'this extremely artificial spread' is the definition.
Although both the answer and 'spread' are adjectives, they are not in the same form of the adjective.

'makes less fat' is the wordplay.
'makes' is an anagram indicator.
'less'+'fat'='lessfat'
'lessfat' with letters rearranged gives 'FALSEST'.

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(Another definition for falsest that I've seen is " Most untrue".)

I've seen this clue in The Telegraph.

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