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Two to go, and I'm stumped! 1 across 'Third note of diatonic scale' (7) --d-a-t Internet search left me utterly bewildered.

Also, 1 down 'Optical magnifiers' (11)
--c-o-c-p-s

Any help gratefully received!

mediant
microscopes

third note of diatonic scale is mediant.
I'm stuck on the other one too.

Microscopes

Thank you fazed, Reedy and Gordon - I can't believe I didn't think of microscopes, but I was a bit hung up on face furniture!