Related to dolt, sadly (4)
I believe the answer is:
told
'related to' is the definition.
(I've seen this in another clue)
'dolt sadly' is the wordplay.
'sadly' is an anagram indicator.
'dolt' with letters rearranged gives 'TOLD'.
(Other definitions for told that I've seen before include "Informed; narrated" , "Said" , "Assured" , "Related (a story)" , "Made an impact" .)