Nervous part of speech (5)

I believe the answer is:

tense

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'nervous' is the definition.
(similar in meaning)

I don't understand how the remainder of the clue works.

(Other definitions for tense that I've seen before include "past, say" , "Taut - timely verbal indication" , "Worried" , "show strain" , "far from comfortable" .)

I've seen this clue in The Mirror.

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