Sunbathers catch them (4)
I believe the answer is:
rays
'sunbathers catch them' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rays that I've seen before include "Beams of sunlight" , "Flat fish" , "Columns of light or heat" , "Beams - fish" , "we hope to catch occasionally out of the blue?" .)