Thanks NAC.
I have the place from across clues and the film from down clues.
I have changed all but I out of 7 letters. Don't know where I goes.
I have the name of the thief (6,8)
I can make a 7 letter name from one of the columns. (Starts with S)
No idea what the two groups are and what the colour is.
Hankir, the I goes in/gets swapped to give one of the groups. The other group has a much longer name, and it doesn't become apparent until most of the revisions have been done. There's a slight trap with the thief, your answer's not long enough. The Across letters don't give just a place, they lead to the first group.