The ray swimming is blue! (6)
I believe the answer is:
earthy
'is blue' is the definition.
(both can mean sexual)
'the ray swimming' is the wordplay.
'swimming' indicates anagramming the letters.
'the'+'ray'='theray'
'theray' with letters rearranged gives 'EARTHY'.
(Other definitions for earthy that I've seen before include "Natural" , "Lusty, coarse" , "Vulgar, of the soil" , "Head covering" , "Coarse like the soil" .)