Carbon copies for heads (5)
I believe the answer is:
capes
'heads' is the definition.
(cape can mean a geographical head or promontory)
'carbon copies' is the wordplay.
'carbon' becomes 'C' (C is the chemical symbol for carbon).
'copies' becomes 'apes' ('ape' can be a synonym of 'copy').
'c'+'apes'='CAPES'
'for' is the link.
(Other definitions for capes that I've seen before include "may be worn" , "Space for cloaks" , "Sleeveless cloaks - promontories" , "Short cloaks" , "Cloaks or headlands" .)