Not the full piece by German boss in paper (8)

I believe the answer is:

fragment

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'not the full piece' is the definition.
I can't judge whether this defines the answer.

'german boss in paper' is the wordplay.
'german boss' becomes 'ragmen' (I can't explain this - if you can you should believe this answer much more).
'in' is an insertion indicator.
'paper' becomes 'ft'.
'ragmen' placed within 'ft' is 'FRAGMENT'.

'by' is the link.

Can you help me to learn more?

(Other definitions for fragment that I've seen before include "Small portion" , "Small piece" , "Come to pieces" , "Shard" , "Broken-off piece" .)

I've seen this clue in the Irish Times.

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