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Stuck on a few.
29ac ??T?u?I Shinto festival abandoned ritualism after fall of fifty-one. [7]
27dn S???E?r Go in on a hike on railway - which provides work for medics. [7]
31ac R?C?? Runs in front of tree snake. [5]
25dn C???A?S Company has millions to go by scale. [7]

any help would be appreciated.

31 Racer

25 compass

25d compass

25 Compass, scale - Co M Pass

27 could be surgery?

29 Matsuri, a festival. (Ritualism minus Li/51).

Thanks; That word isn't in my biggest dictionary!