The most common and most likely answer to this crossword clue is the 5 letter word SOSED
S
O
S
E
D
Buddy explains!
The straight part
We know that "Dispensed good sense having gone adrift?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dispensed good sense having gone adrift? = sosed.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.