Taught soundly, albeit under stress (4)

I believe the answer is:

taut

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'albeit under stress' is the definition.
I can't tell whether this defines the answer.

'taught soundly' is the wordplay.
'soundly' shows a homophone (sound like).
'taught' sounds like 'TAUT'.

Can you help me to learn more?

(Other definitions for taut that I've seen before include "Tense, stretched tight" , "Stretched tight or disciplined" , "Without slack" , "Pulled or drawn tight" , "Fully stretched" .)

I've seen this clue in the Evening Standard.

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