Outfit with German officer at the front in push (3-2-3-2)
I believe the answer is:
get-up-and-go
'push' is the definition.
(synonyms)
'outfit with german officer at the front' is the wordplay.
'outfit' becomes 'getup' (synonyms).
'with' becomes 'and'.
'at the front' suggests taking the first letters.
The first letters of 'german officer' is 'go'.
'getup'+'and'+'go'='GET-UP-AND-GO'
'in' is the link.
(Other definitions for get-up-and-go that I've seen before include "Vim" , "'pizazz'" .)