Company is regressively part of fascist’s eugenics (5)
I believe the answer is:
guest
'company' is the definition.
(I've seen this in another clue)
'regressively part of fascist's eugenics' is the wordplay.
'GUEST' is hidden backwards within the letters.
But, I am not sure how the hidden word is indicated.
'is' is the link.
Can you help me to learn more?
(Other definitions for guest that I've seen before include "See 2" , "Visitor to whom hospitality is extended" , "One receiving hospitality" , "Invited visitor" , "Conjectured audibly" .)