Introduce force, showing initiative (10)
I believe the answer is:
enterprise
'initiative' is the definition.
('enterprise' can be a synonym of 'initiative')
'introduce force' is the wordplay.
'introduce' becomes 'enter' ('enter' can be a synonym of 'introduce').
'force' becomes 'prise' (I've seen this before).
'enter'+'prise'='ENTERPRISE'
'showing' is the link.
(Other definitions for enterprise that I've seen before include "Data may be on-board here" , "business concern" , "Get-up-and-go - venture" , "Plan" , "Company" .)