Note buzz surrounding Alqosh's top prophet (5)
I believe the answer is:
nahum
'prophet' is the definition.
(I've seen this before)
'note buzz surrounding alqosh's top' is the wordplay.
'note' becomes 'n' (abbreviation).
'buzz' becomes 'hum' (synonyms).
'surrounding' means one lot of letters goes inside another.
'top' suggests taking the first letters (in a down clue, the first letter is top).
The initial letter of 'alqosh' is 'a'.
'n'+'hum'='nhum'
'nhum' going around 'a' is 'NAHUM'.
(Other definitions for nahum that I've seen before include "Prophet's book" , "Hebrew prophet - Biblical book" , "OT book and prophet who foretold the fall of Nineveh" , "Minor prophet" , "Destruction-of-Nineveh prophet" .)