Wet weather front of many colours (7)
I believe the answer is:
rainbow
'many colours' is the definition.
'wet weather front' is the wordplay.
'wet weather' becomes 'rain' (I've seen this before).
'front' becomes 'bow' (bow is a kind of front).
'rain'+'bow'='RAINBOW'
'of' is the link.
(Other definitions for rainbow that I've seen before include "Spectral display" , "Colourful phenomenon" , "Water-colour production" , "weather feature" , "'The - - ' by D H Lawrence novel" .)