Revolutionary sextet to back Big Sheep (7)

I believe the answer is:

cheviot

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'big sheep' is the definition.
'cheviot' can be an answer for 'sheep' (Cheviot is an example). I'm unsure of the 'big' bit.

'revolutionary sextet to back' is the wordplay.
'revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
'sextet' becomes 'VI' (synonyms).
'back' says the letters should be written backwards.
'to' reversed gives 'ot'.
'che'+'vi'+'ot'='CHEVIOT'

Can you help me to learn more?

(Other definitions for cheviot that I've seen before include "Northumberland hills; sheep" , "One of flock" .)

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

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