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Hi folks I need help with a few here, please.
13a Surely you'd notice co-ordination between sound and picture, in short (4) ?y?c
20a Affable marine mammal...close up (4) ?e?l (could that be seal ?)
17d/21a Here we lie at the cutting edge of medicine...OR..? (9,4) ?p???t?n? ??o?

Thanking you

sync? (first letters)

Operating room?

seal - to close up+ mammal ?

Thank You, that terrific, should have got those, my brain is working like my laptop ~ two speeds dead slow and stop.
Hope you have a pleasant evening/night.