Start to grasp socially acceptable English dance (7)

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

BEGIN (start) containing [to grasp] U (socially acceptable), then E (English). It’s a sort of slow rumba, perhaps best known from the title of the Cole Porter song Begin the Beguine. It originally appeared in a Broadway show in 1935, but it was this 1938 recording by Artie Shaw and his Orchestra that popularised it so that later it was used in a Fred Astaire film and became a standard recorded by a host famous artists.