Good person given a German mug (5)
I believe the answer is:
stein
'mug' is the definition.
(stein is a kind of mug)
'good person given a german' is the wordplay.
'good person' becomes 'st' (saint).
'given' is a charade indicator (letters next to each other).
'a german' becomes 'ein' ('a' in German).
'st'+'ein'='STEIN'
(Other definitions for stein that I've seen before include "Glass" , "Inset (anag.)" , "Large earthenware beer mug" , "Gertrude __, avant-garde US author, d. 1946" , "Earthenware beer jug" .)