Impute, attribute (7)
I believe the answer is:
ascribe
I believe this is a double definition.
'impute' is the first definition.
(I know that impute can be written as ascribe)
'attribute' is the second definition.
(I know that attribute can be written as ascribe)
(Other definitions for ascribe that I've seen before include "Attribute to, say, an old writer?" , "'Impute, assign (7)'" , "'Attribute, assign (7)'" , "Attribute in Brescia" , "Attribute (something to a cause)" .)