Possible Clues:

• With ''K'' or ''C,'' military food allotment
• See 22
• Give one to a customer, e.g.
• O, that would be one's allowance, in a manner of speaking
• O, this allowance would be bespoke, perhaps
• Allowance of one pest with one on the end
• Parcel out scarce food, say
• Restrict the supply of
• One sailor turned up on allotment
• One helping Horatio Nelson, to some extent