The most common and most likely answer to this crossword clue is the 10 letter word HAM-HANDED
H
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Buddy explains!

The straight part
We know that "clumsy way" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case clumsy way = ham-handed.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.
Crossword Answer definitions
HAM-HANDED adjective- Clumsy, heavy, or inept; not delicate, light or gentle.