Shy of 135 degrees, this smells! (4)
I believe the answer is:
nose
This could be a double definition.
'shy' is the first definition.
The answer and definition can be both to do with motion as well as being verbs in their base form.
Maybe they are linked in a way I don't understand?
'135 degrees this smells' is the second definition.
The definition suggests a singular noun which matches the answer.
'of' is the link.
Can you help me to learn more?
(Other definitions for nose that I've seen before include "Conk (slang)" , "Sense of smell; proceed cautiously" , "See 1" , "Asian wind instrument -- use Teflon (anag)" , "Front of plane" .)