During a concert, a flute piece will do for now (3,3)
I believe the answer is:
pro tem
'for now' is the definition.
(short for pro tempore, meaning for the time being)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for pro tem that I've seen before include "not indefinitely extended" , "For the present" , "For the time being (Latin abbreviation)" , "For the time being, to the old Romans in short" , "Temporarily" .)