Engineer creates extremely significant four-dimensional object (9)

I believe the answer is:

tesseract

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'four-dimensional object' is the definition.
The definition suggests a singular noun which matches the answer.

'engineer creates extremely significant' is the wordplay.
'engineer' indicates anagramming the letters.
'extremely' says to hollow out the word (remove centre letters) (only the extremes of the word are used).
'significant' with its middle removed is 'st'.
'creates'+'st'='createsst'
'createsst' is an anagram of 'TESSERACT'.

Can you help me to learn more?

(Other definitions for tesseract that I've seen before include "Object in maths" , "hypercube" .)

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