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4d Part and all of circle made taking a bow (4) A?C?
7d Some cut, it is suggested, to make skimpy garment (8,7) S?I?M?N? C?S?U?E
I have arch and swimming costume. Not completely sure why.

7 costume is an anagram (swimming ) of some cut

It is arco, not arch.
Arc O.
Part of a circle and a complete circle.

4 D. This was 'arco' and there was a thread about it yesterday - I can't remember the details.

arco

adverb & adjective( music)
1.
(especially as a direction) played on a violin or other stringed instrument using the bow.

Thank you all! Clever use for swimming! I would never have seen that.