Clue: Indicate private is about to be canned? (4)
Answer: SIGN
Explanation: Definition: Indicate
I do not see the wordplay. Is the 'private' GI? If so, it is not a good match, and I cannot justify the SN. Is 'is' to be reversed? Again, I cannot make this stick. An afterthought: I still do not like GI for 'private', but Sn is the chemical symbol for tin, so that 'canned' could indicate put in tin. Tortuous, but at least it is an explanation of sorts. I would be very happy if anyone can come up with something better.