Oddly, German's someone buying a little green jumper (11)
I believe the answer is:
grasshopper
'jumper' is the definition.
(I've seen this before)
'oddly german's someone' is the wordplay.
'oddly' indicates alternate letters (letters in odd-numbered positions).
'someone' becomes 'shopper' (shopper is a kind of someone).
The alternating letters of 'germans' are 'gras'.
'gras'+'shopper'='GRASSHOPPER'
'buying a little green' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for grasshopper that I've seen before include "Excellent jumper" , "six-footer with extra powerful legs" , "Jumping insect" , "Type of cricket" , "Chirping insect" .)