The most common and most likely answer to this crossword clue is the 5 letter word HIMBO
H
I
M
B
O
Buddy explains!
The straight part
We know that "Bit of a hunk" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bit of a hunk = himbo.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.
What does HIMBO mean?
HIMBO noun- A physically attractive man who lacks intelligence; the male equivalent of a bimbo.