Packed with group of players speaking in German (7)
I believe the answer is:
teeming
'packed' is the definition.
(thesaurus)
'group of players speaking in german' is the wordplay.
'group of players' becomes 'team' (I've seen this before).
'speaking' shows a homophone (sound like).
'german' becomes 'g' (abbreviation).
'team' sounds like 'teem'.
'teem'+'in'+'g'='TEEMING'
'with' acts as a link.
(Other definitions for teeming that I've seen before include "Full of people" , "full of creatures?" , "Swarming in to meeting" , "Chock-a-block" , "Pouring - abounding" .)