German theologian never to accept a new Germany (7)

'german theologian' is the definition.
(August Neander, 1789-1850)

'never to accept a new germany' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'an' and 'an' is located in the answer.
'new' could be 'n' (common abbreviation eg NT for New Testament) and 'n' is present in the answer.
'germany' could be 'de' (I've seen this in other clues) and 'de' is found within the answer.
The remaining letters 'er' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).