Boundless puns and fiddles I set on Fridays (6)
I believe the answer is:
untied
'set on fridays' is the definition.
Both the definition and answer are adjectives. Maybe you can see an association between them that I don't see?
'boundless puns and fiddles i' is the wordplay.
'boundless' indicates the central letters (the limits or bounds of the word are removed).
'and' says to put letters next to each other.
'fiddles i' becomes 'tied' (I am not sure about this - if you are sure you should believe this answer much more).
The middle of 'puns' is 'un'.
'un'+'tied'='UNTIED'
Can you help me to learn more?
(Other definitions for untied that I've seen before include "Not fastened" , "Released from 19" , "Picked loose" , "Disconnected" , "'Unfastened, lace say (6)'" .)