15d Tried stew with a small fish in it (3,1,4) H???B?S? -- Had a bash ??
18a One embraced by unusually small person is more drunk (8) T???L??? -- Tiddlier / TROLLied ??
17d Army regiment to ring about special training (8) ???E?I?L -- Remedial ??
16a Engineers considered free from error (8) ?E?E?M?D -- Redeemed ??