Cloak on cop ruined, husband's admitted (6)
I believe the answer is:
poncho
'cloak' is the definition.
(I know that poncho is a type of cloak)
'on cop ruined husband's admitted' is the wordplay.
'ruined' is an anagram indicator.
'husband' becomes 'h' (abbreviation).
'admitted' is an insertion indicator (inserted letters get admitted).
'on'+'cop'='oncop'
'oncop' is an anagram of 'ponco'.
'ponco' going around 'h' is 'PONCHO'.
(Other definitions for poncho that I've seen before include "Garment with slit for the head" , "South American garment" , "A blanket-like cloak with a hole in the centre for the head" , "Blanket-like cloth with centre slit, worn as cloak" , "Chihuahua fashion?" .)