Crossword Genius

Secretly chummy with soldier (2,7)

Ross

I believe the answer is:

in private

'secretly' is the definition.
(I've seen this before)

'chummy with soldier' is the wordplay.
'chummy' becomes 'in' (in the sense of being 'in' with a particular crowd).
'with' is a charade indicator (letters next to each other).
'soldier' becomes 'private' (I've seen this before**).
'in'+'private'='IN PRIVATE'

(Other definitions for in private that I've seen before include "Confidentially" , "behind closed doors" , "secretly" , "behind the scenes" .)

I've seen this clue in The Telegraph.
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