Scattered showers, torrential rain, easily wet naked heads (6)
I believe the answer is:
'scattered' is the definition.
(I've seen this in another clue)
'showers torrential rain easily wet naked heads' is the wordplay.
'heads' indicates taking the first 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" .)