Square one circle at random (9)
I believe the answer is:
reconcile
'square' is the definition.
(I've seen this before)
'one circle at random' is the wordplay.
'at random' indicates an anagram.
'one'+'circle'='onecircle'
'onecircle' anagrammed gives 'RECONCILE'.
(Other definitions for reconcile that I've seen before include "Square" , "Make up, make peace" , "Puccini opera" , "Pacify" , "Show to be compatible" .)