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12A: A part played by the Cartoonist' Foundation? (3,5) -R-, P-P-R
2D: When one line fails, fully ready to switch electrical unit (5) T-S-A

Also three clues where we have answers but cannot see the crypotic components. Can somebody please explain:
1D An unwanted increase: 500 to 1500, say? (6-3,6) Answer is MIDDLE-AGE SPREAD. Why?
10A Provide entertainment and grub without support (5). Answer is CATER, but why?
18D Legend delivered in two halves for the kids (7). Answer is TOOTSIE, but why?

1D An unwanted increase: 500 to 1500, say? (6-3,6) Answer is MIDDLE-AGE SPREAD. Why?
The Middle Ages are from 500 - 1500 AD.

10A Provide entertainment and grub without support (5). Answer is CATER, but why?
No pillar .. caterpillar

art paper
tesla

Many thanks, Paul

tootsie-ie leg end-also normally said as tootsie wootsie.