Excessively high prediction of rigged Emirates vote (12)
I believe the answer is:
overestimate
'excessively high prediction' is the definition.
The answer and definition can be both related to thinking as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'rigged emirates vote' is the wordplay.
'rigged' indicates anagramming the letters.
'emirates'+'vote'='emiratesvote'
'emiratesvote' is an anagram of 'OVERESTIMATE'.
'of' is the link.
Can you help me to learn more?
(Other definitions for overestimate that I've seen before include "Think too highly of" , "Rate too highly" , "give an excessive appraisal" , "Too large a guess" , "Value too highly" .)