It's a bit daft to play around, now! (5)
I believe the answer is:
today
'now' is the definition.
(synonyms)
'it's a bit daft to play around' is the wordplay.
'it's a bit' indicates taking the first letters (I've seen 'bit of' mean this).
'play' becomes 'ay' (I can't justify this - if you can you should believe this answer much more).
'around' indicates putting letters inside.
The initial letter of 'daft' is 'd'.
'to'+'ay'='toay'
'd' put inside 'toay' is 'TODAY'.
Can you help me to learn more?
(Other definitions for today that I've seen before include "Presently" , "12, 12" , "At the present time, in general" , "Modern times" , "The present time or age" .)