Loud string player shielding a wind player (8)
I believe the answer is:
flautist
'wind player' is the definition.
(I've seen this before)
'loud string player shielding a' is the wordplay.
'loud' becomes 'f' (short for forte - 'loud' in music).
'string player' becomes 'lutist' (someone who plays a lute).
'shielding' is an insertion indicator.
'lutist' placed around 'a' is 'lautist'.
'f'+'lautist'='FLAUTIST'
(Other definitions for flautist that I've seen before include "James Galway, say" , "Studio recording period" , "Musician" , "James Galway, for example" , "Player of wind instrument" .)