Suspect friend heading north has debt notices (7)
I believe the answer is:
dubious
'suspect' is the definition.
(thesaurus)
'friend heading north has debt notices' is the wordplay.
'friend' becomes 'bud' (shortly for buddy).
'heading north' is a reversal indicator.
'has' says to put letters next to each other.
'debt notices' becomes 'ious' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'bud' back-to-front is 'dub'.
'dub'+'ious'='DUBIOUS'
Can you help me to learn more?
(Other definitions for dubious that I've seen before include "untrustworthy" , "Doubtful, not convinced" , "Doubtful, uncertain" , "Ambiguous or suspect" , "Sceptical, doubtful" .)