Impressive tactic to overcome disablement (6,6)
I believe the answer is:
master stroke
'impressive tactic' is the definition.
(a master stroke is a very good move or tactic)
'overcome disablement' is the wordplay.
'overcome' becomes 'master' (mastering is a kind of overcoming).
'disablement' becomes 'stroke' (a stroke disables a person).
'master'+'stroke'='MASTER-STROKE'
'to' is the link.
(Other definitions for master stroke that I've seen before include "Coup" , "Very clever move" , "Brilliant move" , "Effective, well-timed act" , "Some Star Trek (anag) - skilful and opportune act" .)