Iron-clad band bangs (6)
I believe the answer is:
fringe
'bangs' is the definition.
(thesaurus)
'iron-clad band' is the wordplay.
'iron' becomes 'fe' (Fe is the chemical symbol for iron).
'clad' means one lot of letters goes inside another (clad can mean covered by).
'band' becomes 'ring' (a ring is a band of metal).
'fe' going around 'ring' is 'FRINGE'.
(Other definitions for fringe that I've seen before include "(Tasselled) border" , "Border trimming" , "Less important" , "Border - unofficial festival events" , "These benefits are additional to pay" .)