Strict husband developed rash (5)
I believe the answer is:
harsh
'strict' is the definition.
(I've seen this in another clue)
'husband developed rash' is the wordplay.
'husband' becomes 'h' (abbreviation).
'developed' indicates an anagram.
'rash' with letters rearranged gives 'arsh'.
'h'+'arsh'='HARSH'
(Other definitions for harsh that I've seen before include "Severe - unkind" , "Punitive" , "Guttural" , "Severe; bleak" , "Unpleasantly stern" .)