Married a doctor that's a hoarder (6)
I believe the answer is:
magpie
'a hoarder' is the definition.
('magpie' can be a synonym of 'hoarder')
'married a doctor that's' is the wordplay.
'married' becomes 'm'.
'doctor' becomes 'gp' (general practitioner).
'that's' becomes 'ie'.
'm'+'a'+'gp'+'ie'='MAGPIE'
(Other definitions for magpie that I've seen before include "Long-tailed crow" , "ring" , "winger" , "A black-and-white thieving bird" , "Black and white bird - a thief" .)