… and a cold shower (8)
I believe the answer is:
snowfall
'cold shower' is the definition.
(I've seen this before)
'and a' is the wordplay.
I cannot quite see how this works, but
'and' could be 'n' (common abbreviation for 'and') and 'n' is located in the answer.
'a' is within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for snowfall that I've seen before include "Dropping of flakes" , "What may appear in winter" , "Precipitation dropping in the form of ice crystals" , "Cold shower" , "Amount of wintry precipitation" .)