Muddled heap can create flamboyance (7)
I believe the answer is:
panache
'flamboyance' is the definition.
(I've seen this in another clue)
'muddled heap can' is the wordplay.
'muddled' indicates an anagram.
'heap'+'can'='heapcan'
'heapcan' is an anagram of 'PANACHE'.
'create' is the link.
(Other definitions for panache that I've seen before include "Flamboyant self-assurance" , "Dash and verve" , "A confident stylish manner" , "Flamboyance - style" , "Sense of style, swagger" .)