The most common and most likely answer to this crossword clue is the 5 plus 10 letter word ROUND SHOULDERED
I've seen this crossword clue in Independent
R
O
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More clues leading to the result ROUND SHOULDERED
Buddy explains!
The straight part
We know that "Having a hunch" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case having a hunch = round shouldered.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 ROUND SHOULDERED mean?
ROUND SHOULDERED adjective- Having a rounded upper back, and shoulders that bend forward.