(28d) Quit some place as electricity's expensive. (5) C E _ _ _ .
(29d) Old leader Benjamin starts and finishes off in a state. (6) I _ R _ _ L.
(31d) The ........ , Irish showband. (7) _ _ _ I _ N S .
(34a) Rents out part of the vessel. (5) _ _ C _ _ .
(36d) Pottered about with the dead rising up over barrels of oil. (7) _ A _ B _ _ D.
The standard barrel of crude oil or other petroleum product (abbreviated BBL) is 42 US gallons (34.972 Imperial gallons or 158.987 L) . . . . learnt something today!