A bit late with this one but it has beaten me.
11D Hard feature in English, oft-repeated, cryptic, without question Edmund's work (3,6,6) T?E/???R?E/?U???E
17A Root out and conveniently put in other half of old drain (9) E?T?R???E
37A Keen on son making pass swiftly (5) S???P
Any help greatly appreciated