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Not all harridans sound dry and uninteresting! (4)

Ross

I believe the answer is:

arid

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'uninteresting' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

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(Other definitions for arid that I've seen before include "Without water" , "(Of an area) very dry" , "(Of land) very dry" , "(Of climate) dry" , "flat" .)

I've seen this clue in the Evening Standard.
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