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19 D.
Sustained melody arising in this opera initially (6)
T - - - T - (not sure of second T)

and 22 A
Sound of car, I note, is to interpose (4,2)
- O - - - N

Finally
26 A
Energy certainly seen in central areas (4)
E - E -

All help appreciated

tenuto (tune up in This Opera initially)

Sound of car, I note, is to interpose (4,2)
- O - - - N

Could be horn in.

Energy certainly seen in central areas (4)
E - E -

E YES = eyes, as eye of a storm, central area

Mnay thanks to both of you - I now have the third, it is HORN IN - I could not find it in my Oxford and at first gave up but later found it is in fact correct.
Thanks again!