Stop shower getting official (7)
I believe the answer is:
refrain
'stop' is the definition.
(I've seen this before)
'shower getting official' is the wordplay.
'shower' becomes 'rain' (synonyms).
'getting' says to put letters next to each other.
'official' becomes 'ref' (match official in football, say).
'rain' put after 'ref' is 'REFRAIN'.
(Other definitions for refrain that I've seen before include "The repeated lines at the end of verses" , "Do without" , "Cease - repeated phrase" , "Forbear from chorus?" , "Main part of song - do not do it" .)