21d) Sanction a parish priest over broadcast (7) A?P?O??
22d) U.S. president once nearly received a shock (6) ?R?U??
24d) Traveller's upset over university affair (5) A????
27d) He peddles fish out of river (4) ?O??
28a) Strike leader impressed by labour group's harmony (6) U?I???
All help greatly appreciated
Thank you again for your prompt and helpful answers. Please do not apologise dannyk13, you gave me the idea and I put in "tout" Hope the washing is dry MargotTester