Archdeacon attending hospital department getting warning about a couple of veins (5,5)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

Ven. (venerable, address for an “archdeacon”) attending A & E (accident and emergency, so “hospital department”) getting CAVE (Latin for “warning”) about A The “venae cavae” are the two major veins which take blood to the heart.