Strategy to have piano used in Javanese orchestra (4,4)
I believe the answer is:
game plan
'strategy' is the definition.
(game plan is a kind of strategy)
'piano used in javanese orchestra' is the wordplay.
'piano' becomes 'p'.
'used in' indicates putting letters inside.
'javanese orchestra' becomes 'gamelan' (type of musical ensemble from Java in Indonesia).
'p' going inside 'gamelan' is 'GAME PLAN'.
'to have' is the link.
(Other definitions for game plan that I've seen before include "Strategy planned in advance" , "business strategy" , "Carefully thought-out strategy for achieving an objective" , "Strategy (in match)" , "Strategy for winning as in sport" .)