A quote misconstrued by reading circle? (7)
I believe the answer is:
equator
'circle?' is the definition.
(equator is a kind of circle)
'a quote misconstrued by reading' is the wordplay.
'misconstrued' is an anagram indicator.
'by' is a charade indicator (letters next to each other).
'reading' becomes 'r' (one of the traditional three R's of education).
'a'+'quote'='aquote'
'aquote' with letters rearranged gives 'equato'.
'equato'+'r'='EQUATOR'
(Other definitions for equator that I've seen before include "Line through Brazil, Kenya, Sumatra" , "It's at zero degrees latitude" , "Imaginary line round the earth" , "Imaginary line around the earth's circumference" , "Circle separating northern and southern hemispheres" .)