Expand German fight (4)
I believe the answer is:
grow
'expand' is the definition.
(I've seen this before)
'german fight' is the wordplay.
'german' becomes 'g' (abbreviation**).
'fight' becomes 'row'.
'g'+'row'='GROW'
(Other definitions for grow that I've seen before include "Wax" , "Increase in size" , "Multiply" , "Get bigger" , "Burgeon" .)