Nazi leader working together with Fox (7)

I believe the answer is:

nonplus

'fox' is the definition.
('nonplus' can be a synonym of 'fox')

'nazi leader working together with' is the wordplay.
'leader' indicates taking the first letters.
'working' becomes 'on'.
'together with' becomes 'plus' (I've seen this before).
The initial letter of 'nazi' is 'n'.
'n'+'on'+'plus'='NONPLUS'

(Other definitions for nonplus that I've seen before include "disadvantageous or neutral, presumably" , "stump" , "Cause dismay" , "Perplex totally" , "Disconcert, confound" .)

I've seen this clue in The Independent.

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