Doing one's best to be a nuisance (6)

I believe the answer is:

trying

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'doing' is the definition.
The definition and answer can be both related to bodily activities as well as being present participle verbs.
Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for trying that I've seen before include "Attempting or irritating" , "Working in a court can be" , "What could be witnessed in court" , "Attempting or stretching patience to the limit" , "undertaking" .)

I've seen this clue in the Evening Standard.

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