Function that sunbather seeks? (3)
I believe the answer is:
tan
'function' is the definition.
(tangent, mathematical function)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for tan that I've seen before include "Brown to beat" , "belt" , "Thrash" , "Lightish brown colour" , "Reddish-brown" .)