Financial protector of home having less doubt (7)
I believe the answer is:
insurer
'financial protector' is the definition.
(insurance provider)
'home having less doubt' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'having less doubt' becomes 'surer' (being more sure or less doubtful).
'in'+'surer'='INSURER'
'of' acts as a link.
(Other definitions for insurer that I've seen before include "Loss adjuster's employer" , "Provider of a security policy" , "One offering policy for risk" , "Company offering policies for premiums" , "Provider of cover" .)