Little Hitler wants injection in the middle of difficult birth (10)

'little hitler' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'injection in the middle of difficult birth' is the wordplay.
'injection' becomes 'lacks' (I can't justify this - if you can you should give a lot more credence to this answer).
'in the middle of' means one lot of letters goes inside another.
'difficult' indicates anagramming the letters.
'birth' is an anagram of 'bhirt'.
'lacks' going inside 'bhirt' is 'BLACKSHIRT'.

'wants' is the link.

Can you help me to learn more?