Not making for, which is inauspicious (8)
I believe the answer is:
untoward
'is inauspicious' is the definition.
(synonyms)
'not making for' is the wordplay.
'not making' becomes 'un' (I can't explain this - if you can you should give a lot more credence to this answer).
'for' becomes 'toward' (I've seen this before).
'un'+'toward'='UNTOWARD'
'which' acts as a link.
Can you help me to learn more?
(Other definitions for untoward that I've seen before include "Unexpected, undesirable" , "Unexpected and inconvenient" , "Adverse - out of the ordinary" , "Unfortunate or adverse" , "Wound rat (anag.)" .)