The most common and most likely answer to this crossword clue is the 10 letter word CUMBERSOME
I've seen this crossword clue in The Times
C
U
M
B
E
R
S
O
M
E
More clues leading to the result CUMBERSOME
- Land taken from previous county, in part hard to manage
- Come across mineral with spiky tip that’s awkward to handle
- Brown’s income, bulky
- Hard to handle Brown’s blocking approach
- Seeing off rum, becomes awkward
- Difficult to use copper extracted from fruits round Maine
- Awkward to handle cucumber, so messy sandwiches
Buddy explains!

The straight part
We know that "hard to manage" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hard to manage = cumbersome.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 CUMBERSOME mean?
CUMBERSOME adjective- Burdensome or hindering, as a weight or drag; vexatious
- Not easily managed or handled; awkward; clumsy.
- Hard, difficult, demanding to handle or get around with.
- Inert, lumbering, slow in movement