Mark on fine band of material (5)
I believe the answer is:
scarf
'band of material' is the definition.
(piece of material worn round the neck)
'mark on fine' is the wordplay.
'mark' becomes 'scar' (synonyms).
'on' says to put letters next to each other.
'fine' becomes 'f' (abbreviation).
'scar'+'f'='SCARF'
(Other definitions for scarf that I've seen before include "Item worn on head or shoulders" , "Garment worn around head or neck" , "Garment for wrapping; muffler" , "One round neck; a wood joint" , "Winter wear" .)