The most common and most likely answer to this crossword clue is the 6 letter word TRICKY
I've seen this crossword clue in The Daily Telegraph
T
R
I
C
K
Y
More clues leading to the result TRICKY
- Regularly turn nasty and difficult
- Awkward time with Richard
- “Massive” British trip hop artist being difficult …
- Tense little boy is difficult to handle
- Difficult finding starters served in toilet roll, and disgusting!
- Little boy, after short time, becomes difficult
- Difficult test involves detective losing diamonds
- Make an effort to carry one hundred kilos — difficult
- Translation’s distasteful and difficult to understand
- Could bridge be called this complicated?
Buddy explains!

The straight part
We know that "difficult" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case difficult = tricky.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 TRICKY mean?
TRICKY adjective- Hard to deal with, complicated
- Adept at using deception
- Relating to or associated with a prostitution trick