Suspicion condensation leads to corrosion (8)
I believe the answer is:
mistrust
'suspicion' is the definition.
(synonyms)
'condensation leads to corrosion' is the wordplay.
'condensation' becomes 'mist'.
'leads to' is a charade indicator (letters next to each other).
'corrosion' becomes 'rust' (rust is a kind of corrosion).
'mist'+'rust'='MISTRUST'
(Other definitions for mistrust that I've seen before include "reservations" , "Have doubts about" , "Have no confidence in (someone)" , "Suspect (someone)" , "Regard with suspicion" .)