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14 Ac - "One put in large order" (4) -I-T
I presume it ends in "T", this being the last
letter of 3 Down, which is "Give up waiting for
magazine", for which I have "Time out".

Fiat

I inside fat - fiat is an order
http://www.thefreedictionary.com/fiat

Fiat = order (arbitrary order; decree)
I - one
fat - large

Many thanks, folks - was thinking of Italian cars
when I considered that possibility!