Behold good man get mislaid (4)
I believe the answer is:
lost
'mislaid' is the definition.
(similar in meaning)
'behold good man' is the wordplay.
'behold' becomes 'lo' (archaic exclamation meaning 'look!').
'good man' becomes 'st' (abbreviation for saint).
'lo'+'st'='LOST'
'get' is the link.
(Other definitions for lost that I've seen before include "See 8" , "Unable to find the way forward" , "Mislaid or strayed" , "confused" , "Unable to be found" .)