The most common and most likely answer to this crossword clue is the 8 letter word UNWIELDY
I've seen this crossword clue in The Times
U
N
W
I
E
L
D
Y
More clues leading to the result UNWIELDY
Buddy explains!

The straight part
We know that "hard to handle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hard to handle = unwieldy.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 UNWIELDY mean?
UNWIELDY adjective- Lacking strength; weak.
- Ungraceful in movement.
- Difficult to carry, handle, manage or operate because of its size, weight, shape or complexity.
- Badly managed or operated.