Credit to ace writer (7)
I believe the answer is:
ascribe
'credit' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for ascribe that I've seen before include "put down" , "Attribute to, say, an old writer?" , "Attribute or impute" , "Attribute (something to a cause)" , "'Attribute, assign (7)'" .)