Bill, he follows Peter with flamboyance (7)
I believe the answer is:
panache
'flamboyance' is the definition.
(thesaurus)
'bill he follows peter' is the wordplay.
'bill' becomes 'ac'.
'follows' means one lot of letters go next to another.
'peter' becomes 'pan' (I've seen this in other clues).
'ac'+'he'='ache'
'ache' after 'pan' is 'PANACHE'.
'with' is the link.
(Other definitions for panache that I've seen before include "Flamboyant confidence" , "stylish carriage" , "'Dash, flair (7)'" , "Brio - flair" , "Grand manner, theatricality" .)