Discussions about this yesterday, could be setters error as clue parses as tail. Someone suggested loco, but if so very bad clue. I have just left mine blank. Although I never send it in just do it for enjoyment
It's clearly an error. The clue for TAILING, which I believe appears elsewhere in the grid, has I suspect been incorrectly replaced, leaving two clues for TAILING and none for the L?C? word.
I know from experience how hard it is to write a 'proper' cryptic clue that leads to two completely different solutions, and this clue is a perfectly good one for TAILING.