Question Author
Thank you very much Mamyalynne and bibblebub for your replies. I did not reply earlier as I was waiting to see if anyone else had anything to offer.
At first, like Mamyalynne, I thought the suggested answer was too weak, although like bibblebub I recognised that this was the best answer available.
I now do see Deceptive=Insidious. But the next word "attractive" in the clue defeated me for a while, but I think this means "put in" as in the word "insidious" "attracts" V (volume) and removes S (special).
I do think this very clue was all quite insidious (and possibly invidious too)!