Nowadays have time for a proverb (5)
I believe the answer is:
adage
'for a proverb' is the definition.
('adage' can be a synonym of 'proverb')
'nowadays have time' is the wordplay.
'nowadays' becomes 'AD' (AD, Anno Domini, as opposed to BC, Before Christ).
'have' says to put 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" .)