Second present is type of shower (4)
I believe the answer is:
snow
'type of shower' is the definition.
'snow' can be an answer for 'shower' (thesaurus). I'm not sure about the 'type of' bit.
'second present' is the wordplay.
'second' becomes 's' (common abbreviation).
'present' becomes 'now' (both can mean the current period).
's'+'now'='SNOW'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for snow that I've seen before include "Precipitation falling as flakes" , "White specks on screen resulting from interference" , "Slangy cocaine or other white stuff" , "Winter weather" , "Vessel" .)