7a-explosive end when not prepared to back the crown (7) ???h?a?. 18a/14a-Blair's "issue" a flipping joke at heart-name added to apply pressure (4,4) ???n/u???. 1d-a minute implant in boob operation, which grows quickly (6) ???b?o. 17d-Domingo's sounding tender? (7) ???a?r. Any help appreciated.
Think I might have got 21a wrong if tenners is right answer. Clue is Sun forced to entertain its own end, which is a bit hairy (8) ?n?h?v?n. I had tax haven.