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3d, S???I??, Notices needing to be reorganised, in part.
5d, P???I??, Incomplete painting, one framed by friend.
6d, L???a???n, Sea - monster left a haven it disturbed.
8a, ?p?e???t, Stimulant reduced - that's a blow.
10a, ????m?, Minister and a politician get in better shape.

3d section (anag)

5 Partial

6 Leviathan

8 Uppercut

10 Revamp

3. section, anagram
5. partial, art + i in pal
6. Leviathan, L + a haven it anagram
8.upper + cut
10. rev + a MP

6d leviathan

Thanks mamya, ginge and elle for help.