JWF, re 24a. Def. is 'Ed's become'. A slang word for 'irritated' (3), (often followed by 'at'), with extra letter ... in 'the elderly'.
Yes, one of the highlighted items is a distinctive shape.
JWF, just to clarify ... it's the 3-letter component of the wordplay which is often followed by 'at', not the definition. The grid entry is unusual, but is in Chambers.
Thanks mattrom, I’d decided “Ed” was someone referred to by his surname elsewhere in the clues before I entered my answer, so I think I got it. I’ve posted it now so fingers crossed…