Clue: Unrestricted approach of swimming yelts, let out earlier (9)
Answer: FREESTYLE
Explanation: Unrestricted approach of swimming yelts, let out earlier (9) 
FREE *(yelts). I'm not sure on the parsing of this clue. Is "swimming" doing double duty, as part of the definition (unrestricted approach to swimming) and as the anagrind? If so, I don't like the clue. Yelts, by the way, are young sows – don't think I've ever seen a pig swim?)