Reportedly owing to condensation (3)
I believe the answer is:
dew
'condensation' is the definition.
(dew is a kind of condensation)
'reportedly owing' is the wordplay.
'reportedly' shows a homophone (sound like).
'owing' becomes 'due' ('due' can be similar in meaning to 'owing').
'due' is a homophone of 'DEW'.
'to' is the link.
(Other definitions for dew that I've seen before include "Dawn deposit" , "Early freshness" , "Moisture on grass" , "Morning or evening condensation" , "Night-time moisture" .)