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1. The instructions just before a crash (5)
2. Join spur wheel after junction, then its smooth running (6)
3. Witches spell instead of Open Sesame perhaps (3,3)
4. Device on an archery bow rest to keep an arrow true (7)
5.Call for a nut cracker(4,7)

2 is trowel

Please can you explain how you get trowel as the answer, maybe a bit slow on the uptake but would like to know

Hi David M
the word - rowel
see here
www.thefreedictionary.com/rowel
after T(T junction)
a trowel is used to smooth plaster.

5 looks like Ring something (ring spanner?)

I think 4 is Plunger

I found this;

Button i.e. Plunger, Burger Button—The button is a device that, when the arrow is being shot, prevents the rear of the arrow from overtaking the front. It also aligns the arrow in the center of the bow and keeps it from hitting the bow once shot