Struggled today, several unsolved.
11. German prince to give speech to voters (10). Assume answer is electorate. But German prince is elector, give speech is orate, which gives electororate, which is obviously wrong.
No idea on the next three.
25. It helps to put on a topical fluid in Puerto Rico. (10).
27. Dull large silver goose (7).
13d. Italian composer briefly interrupting Don's drink (10).