Dodgy group adopting key marketing element? (7)
I believe the answer is:
suspect
'dodgy' is the definition.
(I've seen this before)
'group adopting key marketing element?' is the wordplay.
'group' becomes 'sect' (I've seen this in other clues).
'adopting' is an insertion indicator (inserted letters are taken on or adopted).
'key marketing element?' becomes 'usp' (I can't explain this - if you can you should give a lot more credence to this answer).
'sect' placed around 'usp' is 'SUSPECT'.
Can you help me to learn more?
(Other definitions for suspect that I've seen before include "Believe (someone) guilty" , "Dodgy" , "person in the dock" , "Doubt - man held by police" , "Have qualms about" .)