Possible Clues:

• 'The rest is silence' (rather than 1 9 5 26) with lads - four was most, possibly
• "No way this ends badly for me," perhaps
• More light, say, for old madrigals about tailless beast on two roads
• Noted address before departing
• 16-, 37- and 38-Across, e.g.
• 'Et tu, Brute? Then fall, Caesar!,' e.g
• You'll probably be proved wrong - you too, Brutus?
• Noteworthy closing
• Statement subsequently belied
• "Et tu, Brute?" for example