In torment, as I survey columnar distortion (7)

I believe the answer is:

entasis

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'columnar distortion' is the definition.
The definition suggests a singular noun which matches the answer.

'in torment as i survey' is the wordplay.
'in' says the answer is hidden in the clue.
'ENTASIS' can be found hidden inside 'torment as i survey'.

Can you help me to learn more?

(Other definitions for entasis that I've seen before include "Curvature of column" , "slight bulge in columns" , "Shape of columns" , "Shaping of a column for optical effect" , "swelling in the middle" .)

I've seen this clue in The Guardian.

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