Times Cryptic Jumbo 1371

[NeilMunro]

Very grateful for all help with these clues please.
8dn: “Short withered crack masking very good condition of skin (7).”
35ac: “Animated Character with Old coin after cake (9).”
56ac: “The latest hard, fashionable, Times puzzle setter (6).”
57 ac: “They make better notes - doesn’t respond to them? (8).”

[Captain2]

35 Sponge-bob

[Captain2]

8 serpigo
56 Sphinx

[Captain2]

57 Remedies

[Lie-in King]

8d Serpigo - 'pi(ous)' (very good, in) 'ser(e) (withered, short) go (crack; try)'
35a Spongebob - 'sponge' (cake) + 'bob' (old coin)
56a Sphinx - 'sp (latest) h(ard) in (fashionable) x (times; multiply)'
57a Remedies - 're + me' (notes; music) + 'dies'

[aelmpvw]

57a remedies

[NeilMunro]

Many thanks all!