Soothing substance (4)

I think it could be either:

Which length description are you looking for?:

balm

'soothing substance' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for balm that I've seen before include "Royal holiday residence on the River Dee" , "It's comforting" , "Soothing stuff for lamb" , "Soothing medicine for lamb" , "Soothing herb" .)

I've seen this clue in The Independent and the Penny Press.

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