.... you in the outhouse (4)
I believe the answer is:
thou
'you' is the definition.
(I've seen this before)
'in the outhouse' is the wordplay.
'in' indicates a hidden word.
'THOU' can be found hidden inside 'outhouse'.
(Other definitions for thou that I've seen before include "Old-fashioned pronoun" , "Archaic pronoun" , "Biblical 'you'" , "Refers to the person addressed (archaic)" , "Measure" .)