Revolutionary, a nuisance and of least worth (8)

I believe the answer is:

cheapest

I'm a little stuck... Click here to teach me more about this clue!

'and of least worth' is the definition.
I can't tell whether this definition defines the answer.

'revolutionary a nuisance' is the wordplay.
'revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
'nuisance' becomes 'pest' (I've seen this before).
'che'+'a'+'pest'='CHEAPEST'

Can you help me to learn more?

(Other definitions for cheapest that I've seen before include "The space (anag.)" , "Of the poorest quality" , "Most economical" , "Set peach in least expensive category" , "Most vile" .)

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

Want a hint initially instead of a full solution? Install my app