King George to consume fat in 1728 (5,5)

I believe the answer is:

great gross

'1728' is the definition.
(synonyms)

'king george to consume fat' is the wordplay.
'king george' becomes 'gr' (Georgius Rex).
'to consume' becomes 'eat' (eating is a kind of consuming).
'fat' becomes 'gross' (similar in meaning).
'gr'+'eat'+'gross'='GREAT GROSS'

'in' acts as a link.

(Another definition for great gross that I've seen is " 1728".)

I've seen this clue in The Guardian.

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