Wrong to be suspicious with a promotion (4)
I believe the answer is:
awry
'wrong' is the definition.
(synonyms)
'with a promotion' is the wordplay.
'with' says to put letters next to each other.
'promotion' becomes 'wry' (I can't explain this - if you can you should give a lot more credence to this answer).
'a' put next to 'wry' is 'AWRY'.
'to be suspicious' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for awry that I've seen before include "being on the wrong course" , "Distorted, crooked" , "Crooked; amiss" , "(Gone) askew" , "Crooked, twisted to one side" .)