Exchange first two pieces in game as gambit (6)
I believe the answer is:
tactic
'gambit' is the definition.
(I've seen this in another clue)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for tactic that I've seen before include "element of strategy" , "Plan, manoeuvre" , "Manoeuvre designed to outwit enemy" , "An action planned to achieve a specific end" , "Strategy carefully planned to achieve a specific end" .)