Sun and showers give one colour, naturally (7)
I believe the answer is:
rainbow
'one colour naturally' is the definition.
I can't judge whether this definition defines the answer.
'sun and showers' is the wordplay.
'sun' becomes 'bow' (I can't justify this - if you can you should believe this answer much more).
'and' means one lot of letters go next to another.
'showers' becomes 'rain' (rain showers).
'bow' put after 'rain' is 'RAINBOW'.
'give' is the link.
Can you help me to learn more?
(Other definitions for rainbow that I've seen before include "Heavenly phenomenon" , "Multicoloured atmospheric phenomenon" , "Multi-coloured arc in the sky" , "'Somewhere over the ...' (song) (7)" , "'The - - ' by D H Lawrence novel" .)