Double first from Reading in German (6)
I believe the answer is:
ringer
'double first' is the definition.
'ringer' can be an answer for 'double' (I've seen this before). I'm not sure about the 'first' bit.
'reading in german' is the wordplay.
'reading' becomes 'r' (one of the traditional three R's of education).
'german' becomes 'ger' (abbreviation).
'r'+'in'+'ger'='RINGER'
'from' is the link.
Can you help me to learn more?
(Other definitions for ringer that I've seen before include "One calling" , "One making the toll" , "match" , "American impostor" , "Campanologist - if dead, double" .)