Band of copper with odd number stamped in boss (10)
I believe the answer is:
cummerbund
'band' is the definition.
(band worn around the chest)
'copper with odd number stamped in boss' is the wordplay.
'copper with' becomes 'cu' (chemical symbol. I am not sure about the 'with' bit.).
'odd' indicates an anagram.
'stamped in' indicates putting letters inside.
'boss' becomes 'md' (short for managing director).
'number' with letters rearranged gives 'merbun'.
'merbun' going within 'md' is 'mmerbund'.
'cu'+'mmerbund'='CUMMERBUND'
'of' acts as a link.
(Other definitions for cummerbund that I've seen before include "Broad sash" , "Sash round waist" , "Evening dress waist band" .)