Last few. 18a Philosopher and writer - one feminine Spanish male, one masculine (7) U?A?S?O
25d Boy detective may uncover return of the third man (4) ?M?L EMIL?
4d Twain's gambler's emoticans, perhaps (7) S?I?E?S SMILERS?
7d Swift activity. Prior approach. (7) S?T?R?S?? Why would this be SATIRISED?
20a Archbishop in secret service featured in Franken drama (7) C?A???A Why would this be CHANDRA?
Thanks for help.