End trial with explosion destroying a part of plant (7)

I believe the answer is:

tendril

'a part of plant' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for tendril that I've seen before include "Part of plant that clings for support" , "Climbing plant's supporter" , "Twining shoot" , "Clinging part of a plant" , "A creeper, or a curl of hair" .)

I've seen this clue in The Guardian.

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End trial with explosion destroy­ing a part of plant (7)

End trial with explosion destroying a part of plant (7)