Its not important to have a three-way translation (6)
I believe the answer is:
trivia
'its not important to have a' is the definition.
I can't tell whether this defines the answer.
'three-way translation' is the wordplay.
I cannot really understand how this works, but
'three' could be 'tri' (prefix meaning 'three') and 'tri' is located in the answer.
'way' could be 'via' (I've seen this in other clues) and 'via' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for trivia that I've seen before include "Something of little importance" , "Things of little importance" , "Unimportant things or details" , "Unimportant things, don't waste time on them" , "minor points of interest?" .)