Man to speak to for capital investment (9)
I believe the answer is:
headdress
'for capital investment' is the definition.
(I've seen this before)
'man to speak' is the wordplay.
'man' becomes 'he' (he refers to a man).
'to speak' becomes 'address' (synonyms).
'he'+'address'='HEADDRESS'
'to' is the link.
(Other definitions for headdress that I've seen before include "ceremonial gear" , "Plumed helmet" , "capital investment" , "top gear" , "Ceremonial wear" .)