'Cervid' rook? Dictionary essentially misspelling term (3,4)

I believe the answer is:

roe deer

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'cervid' is the definition.
(roe deer is a kind of cervid)

'rook? dictionary essentially misspelling term' is the wordplay.
'rook?' becomes 'R' (chess abbreviation).
'dictionary' becomes 'COED' (Concise Oxford English Dictionary).
'essentially' means to look at the middle letters.
'misspelling term' becomes 'deer' (I can't justify this - if you can you should give a lot more credence to this answer).
The central letters of 'coed' are 'oe'.
'r'+'oe'+'deer'='ROE-DEER'

Can you help me to learn more?

(Other definitions for roe deer that I've seen before include "Ruminants" , "Cervine animal" , "Graceful animal with small antlers" , "Native wild animal" , "Small antlered animal(s)" .)

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