The most common and most likely answer to this crossword clue is the 10 letter word UNREWARDED
I've seen this crossword clue in The Daily Telegraph
U
N
R
E
W
A
R
D
E
D
Buddy explains!

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 UNREWARDED mean?
UNREWARDED adjective- Not rewarded