Haggard's German relative (5)
I believe the answer is:
gaunt
'haggard's' is the definition.
('gaunt' can be a synonym of 'haggard')
'german relative' is the wordplay.
'german' becomes 'g' (abbreviation**).
'relative' becomes 'aunt' (aunt is a kind of relative).
'g'+'aunt'='GAUNT'
(Other definitions for gaunt that I've seen before include "Thin or emaciated" , "Very thin especially from disease or hunger" , "Hollow-eyed, skinny" , "Very slight" , "birthplace of Edward's son" .)