Smash prof's ironware — POW! (8,2,3)
I believe the answer is:
prisoner of war
'pow' is the definition.
(abbreviation)
'smash prof's ironware' is the wordplay.
'smash' indicates anagramming the letters.
'profs'+'ironware'='profsironware'
'profsironware' with letters rearranged gives 'PRISONER OF WAR'.
(Other definitions for prisoner of war that I've seen before include "Captured member of enemy forces" , "E.g. Stalag inmate" , "POW in full" , "Captured soldier" , "Enemy captive" .)