Eddy, top conductor, hogging large mike (9)
I believe the answer is:
maelstrom
'eddy' is the definition.
(I've seen this before)
'top conductor hogging large mike' is the wordplay.
'top conductor' becomes 'maestro' (I've seen this before).
'hogging' indicates putting letters inside.
'large' becomes 'l'.
'mike' becomes 'm' (phonetic alphabet: alpha, bravo, charlie etc.).
'maestro' going around 'l' is 'maelstro'.
'maelstro'+'m'='MAELSTROM'
(Other definitions for maelstrom that I've seen before include "disorder" , "great confusion" , "Large whirlpool" , "danger to shipping" , "Norwegian whirlpool" .)