Gold German is a bore (5)
I believe the answer is:
auger
'a bore' is the definition.
(I've seen this in another clue)
'gold german' is the wordplay.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'german' becomes 'ger' (abbreviation).
'au'+'ger'='AUGER'
'is' acts as a link.
(Other definitions for auger that I've seen before include "A tool for boring hole in wood" , "Tool for boring holes in wood" , "Tool with spiral point for boring" , "A drilling tool" , "I bore" .)