Perfect example of soldier working to defend head of Government (7)
I believe the answer is:
paragon
'perfect example' is the definition.
(I've seen this before)
'soldier working to defend head of government' is the wordplay.
'soldier' becomes 'para' (para is a kind of soldier**).
'working' becomes 'on'.
'to defend' indicates putting letters inside.
'head of' says to take the initial letters.
The initial letter of 'government' is 'g'.
'para'+'on'='paraon'
'paraon' enclosing 'g' is 'PARAGON'.
'of' is the link.
(Other definitions for paragon that I've seen before include "Perfect diamond" , "Role model" , "Exemplar" , "Model of excellence or perfection" , "Flawless model" .)