Unfinished journey by way of Lima? Of little importance (7)
I believe the answer is:
trivial
'of little importance' is the definition.
(I've seen this before)
'unfinished journey by way of lima?' is the wordplay.
'unfinished' means to remove the last letter.
'journey' becomes 'trip' (trip is a kind of journey).
'by way of' becomes 'via' (via means by way of or by means of).
'lima?' becomes 'L' (phonetic alphabet: alpha, bravo, charlie etc.).
'trip' with its last letter taken off is 'tri'.
'tri'+'via'+'l'='TRIVIAL'
(Other definitions for trivial that I've seen before include "Very easy" , "Of little value" , "Meaningless" , "Trifling" , "Insignificant" .)