Fixed way of truth (3)
I believe the answer is:
rut
'fixed way' is the definition.
'rut' can be an answer for 'way' (rut is a kind of way). I'm not sure about the 'fixed' bit.
'of truth' is the wordplay.
'of' indicates a hidden word.
'RUT' is hidden within 'truth'.
Can you help me to learn more?
(Other definitions for rut that I've seen before include "occupying male deer in autumn" , "does get followed during this" , "Deep track or tedious routine" , "Pothole" , "Deep track or bad habit" .)