Scattered showers, torrential rain, easily wet naked heads (6)
I believe the answer is:
strewn
'scattered' is the definition.
(I've seen this before)
'showers torrential rain easily wet naked heads' is the wordplay.
'heads' says to take the initial letters.
The initial letters of 'showers torrential rain easily wet naked' is 'STREWN'.
(Other definitions for strewn that I've seen before include "Spread untidily" , "Spread everywhere" , "Native of Brittany" , "Scattered about, littered" , "Scattered loosely" .)