2695: Struck hard

A word can be prefixed by six unclued lights so as to form new words (including two place names). 9D is a pertinent piece of poetry (five words). Solvers must shade the appropriate unclued light.

Across

1 Pepper makes host back off (5)

6 Butterfly and weathercock fool about (7)

11    Small fly buzzing round yellow plant (10)

13    With head of arrow no good, perhaps 75-year old is returning missile (9)

15    Paint waterfall about noon (4)

16    Prosecutor up to fitting cubic blocks (7)

17    Film star Richard talked of secluded retreat for antelope (7)

18    Fish? Some stay underwater (3)

19...