Government diet (7)

I believe the answer is:

regimen

I believe this clue is a double definition.

'government' is the first definition.
(I've seen this before)

'diet' is the second definition.
(a diet is a certain eating regimen)

(Other definitions for regimen that I've seen before include "Disciplined system" , "administration" , "Prescribed system of diet and exercise - mere gin (anag)" , "Merge in (anag.)" , "Method of working" .)

I've seen this clue in The Globe and Mail.

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