Put down as unprofessional (3)
I believe the answer is:
lay
I believe this clue is a double definition.
'put down' is the first definition.
(laying is a kind of putting down)
'unprofessional' is the second definition.
(I've seen this before)
'as' acts as a link.
(Other definitions for lay that I've seen before include "Put down; lyric" , "Not ordained; song" , "Secular; set" , "Air" , "located" .)