Feeling unfinished tennis set was reset (8)

I believe the answer is:

sentient

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'feeling' is the definition.
(synonyms)

I can't explain the rest of the clue.

(Other definitions for sentient that I've seen before include "Able to perceive or feel things" , "Capable of feeling and perceiving things" , "Having feelings" , "Able to perceive/feel" , "Endowed with feeling and consciousness" .)

I've seen this clue in the Sydney Morning Herald.

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