Succeed as a chum strutted outrageously (3,3,7)
I believe the answer is:
cut the mustard
'succeed' is the definition.
(I've seen this in another clue)
'a chum strutted outrageously' is the wordplay.
'outrageously' is an anagram indicator.
'a'+'chum'+'strutted'='achumstrutted'
'achumstrutted' anagrammed gives 'CUT THE MUSTARD'.
'as' is the link.
(Other definitions for cut the mustard that I've seen before include "Perform to standard" , "should prove acceptable" , "Make the grade" , "Make a favourable impression" , "do well enough" .)