Device for carrying back, say, fatty mixture (10)

I believe the answer is:

hodgepodge

'mixture' is the definition.
(hodgepodge is a kind of mixture)

'device for carrying back say fatty' is the wordplay.
'device for carrying' becomes 'hod' (carrying device used by builders).
'back' says the letters should be written backwards.
'say' becomes 'eg'.
'fatty' becomes 'podge'.
'eg' reversed gives 'ge'.
'hod'+'ge'+'podge'='HODGEPODGE'

I've seen this clue in The Guardian.

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