Manager reserves parking for conductor (6)
I believe the answer is:
copper
'conductor' is the definition.
(copper is a kind of conductor)
'manager reserves parking' is the wordplay.
'manager' becomes 'coper' (someone who manages or copes).
'reserves' is an insertion indicator.
'parking' becomes 'p' (abbreviation on road signs).
'coper' placed around 'p' is 'COPPER'.
'for' is the link.
(Other definitions for copper that I've seen before include "bluebottle" , "Chemical element, symbol Cu" , "detector?" , "Daily Beast proprietor" , "Metal, Cu" .)