A man with common sense holds one to be shocking (7)
I believe the answer is:
heinous
'be shocking' is the definition.
(thesaurus)
'a man with common sense holds one' is the wordplay.
'a man' becomes 'he' (**).
'with' says to put letters next to each other.
'common sense' becomes 'nous' (nous is a kind of common sense).
'holds' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'he'+'nous'='henous'
'henous' enclosing 'i' is 'HEINOUS'.
'to' acts as a link.
(Other definitions for heinous that I've seen before include "Awful" , "Utterly odious (crime)" , "Shockingly wicked" , "Wicked (offence)" , "Hateful" .)