Western lawman providing organ and piano (4)
I believe the answer is:
earp
'western lawman' is the definition.
(I've seen this in another clue)
'organ and piano' is the wordplay.
'organ' becomes 'ear' (the ear is an organ).
'and' is a charade indicator (letters next to each other).
'piano' becomes 'p' (musical abbreviation).
'ear'+'p'='EARP'
'providing' acts as a link.
(Other definitions for earp that I've seen before include "Wyatt -, renowned US lawman" , "Wyatt - (O.K. Corral)" , "Wyatt - - (US marshal)" , "Wyatt --, Tombstone lawman" , "Wyatt --, US law officer" .)