One in senior competition welcoming Tom Daley say — a legendary figure (11)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

I (one) in SR (senior) BEE (competition) around or ‘welcoming’ DIVER (Tom Daley, say). We thought we may be looking for one of the Knights of the Round Table when we had all the crossing letters but it took a while for us to think of BEE as a competition.