Untidy woman’s hospital attendant (10)
I believe the answer is:
disorderly
'untidy' is the definition.
(similar in meaning)
'woman's hospital attendant' is the wordplay.
'woman's' becomes 'di's' (Di is short for Diana).
'hospital attendant' becomes 'orderly' (synonyms).
'dis'+'orderly'='DISORDERLY'
(Other definitions for disorderly that I've seen before include "disturbance of the peace" , "a mess" , "confused?" , "Lacking organisation" , "Companion of drunk" .)