Soundly taught, albeit under stress (4)
I believe the answer is:
taut
'albeit under stress' is the definition.
I can't judge whether this definition defines the answer.
'soundly taught' is the wordplay.
'soundly' shows a homophone (sound like).
'taught' is a homophone of 'TAUT'.
Can you help me to learn more?
(Other definitions for taut that I've seen before include "On the slope" , "Tense, stretched tight" , "Without slack" , "Held in tension" , "Tightly drawn" .)