Italian poet’s output ultimately digested by Scandinavian (5)
I believe the answer is:
dante
'italian poet's' is the definition.
(Dante Alighieri)
'output ultimately digested by scandinavian' is the wordplay.
'ultimately' says to take the final letters.
'digested' is an insertion indicator.
'by scandinavian' becomes 'dane' (person from Denmark. I am not sure about the 'by' bit.).
The final letter of 'output' is 't'.
't' placed within 'dane' is 'DANTE'.
Can you help me to learn more?
(Other definitions for dante that I've seen before include "Great Italian poet of 'The Divine Comedy'" , "Finally stand before" , "Net Da a poet" , "Author of the Divine Comedy, d. 1321" , "Thirteenth to fourteenth century Italian poet" .)