Put "unprofessional" (3)
I believe the answer is:
lay
I believe this clue is a double definition.
'put' is the first definition.
(I know that put can be written as lay)
'unprofessional' is the second definition.
(as in a layman)
(Other definitions for lay that I've seen before include "Not professional" , "in which hens regularly produce eggs?" , "Song-ballad" , "Air" , "Of bird, produce egg" .)