Month redirecting fuel - it is dishonest (9)
I believe the answer is:
deceitful
'dishonest' is the definition.
(similar in meaning)
'month redirecting fuel it' is the wordplay.
'month' becomes 'dec' (abbreviation for December).
'redirecting' is an anagram indicator (I've seen 'redirected' mean this).
'fuel'+'it'='fuelit'
'fuelit' with letters rearranged gives 'eitful'.
'dec'+'eitful'='DECEITFUL'
'is' is the link.
(Other definitions for deceitful that I've seen before include "Dishonest" , "cheating" , "Duplicitous" , "Deliberately misleading" , "unreliable" .)