Nowadays have time for a proverb (5)
I believe the answer is:
adage
'for a proverb' is the definition.
(synonyms)
'nowadays have time' is the wordplay.
'nowadays' becomes 'AD' (AD, Anno Domini, as opposed to BC, Before Christ).
'have' is a charade indicator (letters next to each other).
'time' becomes 'age' (an age is a period of time).
'ad'+'age'='ADAGE'
(Other definitions for adage that I've seen before include "Old saw" , "Short statement expressing a general truth" , "Well-remembered proverb or saying" , "True proverb or saying" , "Proverb expressing a general truth" .)