Eight unclued lights are of a kind; as is, fancifully, the ninth.

Across

6    Hurry up to fill space with one big cup (6)
12    Ape, given exercise to open fish, discarded skin (10, two words)
13    I agree Spain is rarely pleasant (5)
15    Unable to move furniture? Sure (10)
16    Witter about horse (7)
20    Regrets advancing second scheme (4)
22    Café undecided about installing organ (7, two words)
24    Swearing mildly at work on mushroom (7)
26    Stung in clear light (7)
31    A canine booted from the council (7)
34    Assisted once to fly round Luxembourg (4)
36    Hot during fine concert, turning to relieving drug (7)
38    Jaguars on...