It may be rude to make a digression (6)
I believe the answer is:
detour
'a digression' is the definition.
(thesaurus)
'it may be rude to' is the wordplay.
'it may be' indicates an anagram (I've seen this in other clues).
'rude'+'to'='rudeto'
'rudeto' anagrammed gives 'DETOUR'.
'make' acts as a link.
(Other definitions for detour that I've seen before include "Deviation from usual course" , "Temporary route" , "A way around or deviation from intended route" , "Circuitous alternative to direct path" , "Indirect route" .)