Large journal exchanging two letters for Scottish player? (8)
I believe the answer is:
bagpiper
'player?' is the definition.
(bagpiper is a kind of player)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for bagpiper that I've seen before include "Wind musician" , "(Scottish) musician" , "One blows out air" , "Pibroch player" , "Player of traditional Scottish musical instrument" .)