Highly regarded after a tedious part (5)
I believe the answer is:
rated
'highly regarded' is the definition.
(I've seen this before)
'after a tedious part' is the wordplay.
'part' indicates a hidden word.
'RATED' is hidden within 'after a tedious'.
(Other definitions for rated that I've seen before include "Assessed in trade" , "Adjudged" , "Estimated the value or assigned a ranking" , "Thought highly of" , "Graded, ranked" .)