Owing to condensation, we hear (3)
I believe the answer is:
due
'owing' is the definition.
(similar in meaning)
'condensation we hear' is the wordplay.
'condensation' becomes 'dew' (dew is a kind of condensation).
'we hear' indicates a 'sounds like' (homophone) clue.
'dew' sounds like 'DUE'.
'to' acts as a link.
(Other definitions for due that I've seen before include "Appropriate - fee - requiring payment" , "deserts" , "Expected; proper" , "Entitlement" , "Expected; appropriate" .)