2766: Letters latent

Within seven unclued lights are spelled out the ingredients of the eighth, which solvers must shade. The unclued lights are suggested by surplus words in eight clues. Across 1 Old men with tastes in small cakes (8) 9 Son in new trial practising beforehand (10) 14 Hogarth’s greatest painting? (3) 16 Cross composer snubbed poet

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