Where to see Isaac and Ruth regularly collude with Will (3,9)
I believe the answer is:
old testament
'where to see isaac and ruth regularly' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'collude with will' is the wordplay.
'collude with' becomes 'old' (I can't explain this - if you can you should give a lot more credence to this answer).
'will' becomes 'testament' (synonyms).
'old'+'testament'='OLD TESTAMENT'
Can you help me to learn more?
(Other definitions for old testament that I've seen before include "Genesis, Exodus etc" , "religious work" , "Modest talent (anag.)" , "Job, for example, to be found here" , "First part of the Bible" .)