Isn't saying much, as Adam is consumed by diplomacy covering The Ashes (8)

I believe the answer is:

taciturn

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I'm afraid I can't explain this answer.

(Other definitions for taciturn that I've seen before include "Talking little" , "Far from talkative" , "Habitually uncommunicative, saying little" , "Disinclined to speak" , "Tending to silence" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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