Possible Clues:

• Secrete milk
• Produce milk
• Make milk
• Supply mother's milk
• Most new mums do it, tardily pocketing bill
• Cattle regrouping round small area produce milk
• Holsteins do this
• A cattle dealer expects his stock to do this
• Sounds as if one may be without Tate for the Milky Way
• Feed baby no more, having swallowed document