Correspondence regularly rejected by soviet cadre? (5)
I believe the answer is:
ratio
'correspondence' is the definition.
(thesaurus)
'regularly rejected by soviet cadre?' is the wordplay.
I cannot really see how this works, but
'by' could be 'at' and 'at' is found in the answer.
The remaining letters 'rio' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for ratio that I've seen before include "One to one - maybe" , "Mathematical relation of one thing to another" , "Proportional measure" , "Relationship of numbers" , "Relative magnitude" .)