The unclued lights (one of two words) may be paired, one past and one present.

        Across

   1    USA dealt out compliments (8)

11    It’s still a healthy drink in spring! (7,5)

14    Go on to take legal action (7)

18    Parallel grooves are first adjusted (6)

23    Irritable, like our cats and dogs? (7)

24    Title father backs for Tarzan (3-3)

25    Salmon, by the way, for fellow presenter (2-4)

27    Example of first person in record book (7)

29    University officials South African cricketer Mike’s suggested (8)

33    Continuous story broadcast back in the Home Counties and London, initially (6)

35    Resistance units – I see thousands (4)

37    Seeking...