When out of breath, the rain can seem worse (6)
I believe the answer is:
shower
'when out' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see a link between them that I can't see?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for shower that I've seen before include "Short fall of rain" , "volley" , "One who indicates way" , "Brief light fall of rain" , "Washing facility - worthless lot" .)