The planet's turn for a bit of rain, and maybe sun (6)
I believe the answer is:
uranus
'the planet's' is the definition.
(Uranus is an example)
'turn for a bit of rain and maybe sun' is the wordplay.
'turn' becomes 'u' (a 'U-turn' is a kind of turn).
'for' says to put letters next to each other.
'a bit of' suggests taking the first letters.
'maybe' indicates anagramming the letters.
The initial letters of 'rain and' is 'ra'.
'sun' is an anagram of 'nus'.
'u'+'ra'+'nus'='URANUS'
(Other definitions for uranus that I've seen before include "Ringed planet" , "Giant planet" , "Planet - Greek god of the sky" , "space traveller" , "Planet discovered by William Herschell in 1781" .)