Organ loud — friend set up aural covering (7)
I believe the answer is:
earflap
'aural covering' is the definition.
'earflap' can be an answer for 'covering' (earflap is a kind of covering). I am not certain of the 'aural' bit.
'organ loud friend set up' is the wordplay.
'organ' becomes 'ear' (the ear is an organ).
'loud' becomes 'f' (short for forte - 'loud' in music).
'friend' becomes 'pal' (pal can mean a friend).
'set up' is a reversal indicator (in a down clue, letters go up).
'pal' backwards is 'lap'.
'ear'+'f'+'lap'='EARFLAP'
Can you help me to learn more?
(Other definitions for earflap that I've seen before include "Part of headgear" , "ski gear?" , "Winter hat feature" .)