Military leader acceptable - that is, beginning to supply biscuits (7)

I believe the answer is:

'biscuits' is the definition.
('cookie' can be a synonym of 'biscuit')

'military leader acceptable that is beginning to supply' is the wordplay.
'military leader' becomes 'co'.
'acceptable' becomes 'OK' (OK can mean acceptable or fine).
'that is' becomes 'ie' (abbreviation for id est, 'that is' in Latin).
'beginning to' says to take the initial letters.
The initial letter of 'supply' is 's'.
'co'+'ok'+'ie'+'s'='COOKIES'

(Another definition for cookies that I've seen is " American biscuits".)

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