Few can thus express relief (4)

I believe the answer is:

phew

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I'm afraid I can't even guess how this answer relates to the clue.

(Other definitions for phew that I've seen before include "Gosh, that's a relief!" , "Recover unharmed" , "I'm overheating?" , "Gosh, I'm sweltering!" , "thank goodness!" .)

I've seen this clue in the Evening Standard.

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