Eight unclued lights are of a kind.

Across

5               Al Gore eats by the truckload (6)

9               Dim and confused, fell in and died (3-7)

14            Boxer from Hayle is oddly knocked out (3)

16            Case of invertebrate found in hydrochloric acid (6)

17            March with nudists’ leader in buff (5)

18            Tramp about with stupid person (5)

20            Induced naked coward to take up arms (2,2,3)

22            Passionate female parted, leaving son (7)

24            Just cooked books after bad deal with European (2,5)

25            Horse wearing bridle is a runner (5)

26            Am not ultimately lofty in any way (2,3)

31            Boozer with vacuous air and extremely dubious guts (7)