Nowadays have a lot of time for maxims (6)
I believe the answer is:
adages
'for maxims' is the definition.
(I've seen this before)
'nowadays have a lot of time' is the wordplay.
'nowadays' becomes 'AD' (AD, Anno Domini, as opposed to BC, Before Christ).
'have' means one lot of letters go next to another.
'a lot of time' becomes 'ages' (I've seen this in another clue).
'ad'+'ages'='ADAGES'
(Other definitions for adages that I've seen before include "Old sayings or maxims" , "Old familiar sayings" , "Wise old sayings" , "Maxims, saws" , "Old sayings, proverbs" .)