Hold back others before shower (8)
I believe the answer is:
restrain
'hold back' is the definition.
(I know that hold back can be written as restrain)
'others before shower' is the wordplay.
'others' becomes 'rest' (eg the rest of a group).
'before' is a charade indicator (letters next to each other).
'shower' becomes 'rain' (rainfall).
'rest'+'rain'='RESTRAIN'
(Other definitions for restrain that I've seen before include "Manacle" , "Control - check" , "use handcuffs?" , "Limit" , "Keep in check" .)