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Become tumescent (about 4 feet almost), as hit recording artists do (4,4).

?E?L ?E?H The L might be wrong, pretty certain about the others

15a is c L arity ...making yours ... sell well

Yes, I get it - swell around ell, ancient measure about 4 feet. Thanks.
I had 15 across as charity, definition being non profit-maker - clue could be read either way but only your way produces sell well. Thanks, J