Crossword Genius

Soldier's characteristic warning to keep out? (7,8)

Ross

I believe the answer is:

private property

I'm a little stuck... Click here to teach me more about this clue!

'warning to keep out?' is the definition.
I can't judge whether this defines the answer.

'soldier's characteristic' is the wordplay.
'soldier' becomes 'private' (private is a type of soldier).
'characteristic' becomes 'property' (I've seen this before).
'private'+'property'='PRIVATE-PROPERTY'

Can you help me to learn more?

(Another definition for private property that I've seen is " personal items?".)

I've seen this clue in The Telegraph.
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