Non-expert (6)
'non-expert' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for layman that I've seen before include "He's not clergy or army" , "Someone who is not an expert" , "Non-professional male" , "One without professional knowledge" , "He's not a cleric" .)
'nonexpert' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lay that I've seen before include "Was lying" , "Place (bet)" , "located" , "gamble" , "Stake (a bet); song" .)