Three I wasn't sure of...
6D Expose one in love (4); N _ _ _
10A Marine guide turns into wicked old grandee (9); M _ G _ _ _ I _ O
13A Order a feeding frenzy (4); _ I _ T
I'm thinking NAME for 6D; MAGNIFICO for 10A; and LIST for 13A, but if these are right, I can't see how they satisfy the whole clue.
If Magnifico is right, then 6D is N _ I _