Trumpeter releases Mountain Man (7)
I believe the answer is:
herbert
'man' is the definition.
'trumpeter releases mountain' is the wordplay.
'trumpeter' becomes 'Herb Alpert' (American trumpeter).
'releases' suggests deleting specific letters.
'mountain' becomes 'alp' (the Alps are a mountain range).
'herbalpert' with 'alp' taken out is 'HERBERT'.
(Other definitions for herbert that I've seen before include "Tree" , "A. P. -. English novelist" , "metaphysical poet" , "-- von Karajan, conductor" .)