On vacation dance students get out of shape (6)

I believe the answer is:

deform

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'shape' is the definition.
(I know that deform is a type of shape)

'on vacation dance students get out of' is the wordplay.
'on vacation' says to hollow out the word (remove centre letters).
'students' becomes 'rm' (I can't explain this - if you can you should believe this answer much more).
'get' means one lot of letters goes inside another.
'out' is an anagram indicator.
'dance' with its middle removed is 'de'.
'de'+'rm'='derm'
'of' anagrammed gives 'fo'.
'derm' placed around 'fo' is 'DEFORM'.

Can you help me to learn more?

(Other definitions for deform that I've seen before include "Misshape" , "Put out of shape" , "Contort" , "buckle" , "Distort out of shape" .)

I've seen this clue in the Sydney Morning Herald.

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