Minor facts for working parties (7)
I believe the answer is:
details
'minor facts' is the definition.
'details' can be an answer for 'facts' (detail is a kind of fact). I am not sure about the 'minor' bit.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for details that I've seen before include "Small features" , "Particulars, small parts" , "Minutiae" .)