End up in the wrong, like a monkey (6)
I believe the answer is:
simian
'like a monkey' is the definition.
(I've seen this before)
'end up in the wrong' is the wordplay.
'end up' becomes 'mia' (I've seen this in other clues).
'in' indicates putting letters inside.
'the wrong' becomes 'sin' (I've seen this before).
'mia' inserted within 'sin' is 'SIMIAN'.
(Other definitions for simian that I've seen before include "Resembling an ape or monkey" , "Of monkeys and apes" , "To do with or looking like a monkey" , "Ape-like - in Siam (anag)" , "Relating to monkeys" .)