The most common and most likely answer to this crossword clue is the 6 letter word SHIFTY
I've seen this crossword clue in Financial Times
S
H
I
F
T
Y
More clues leading to the result SHIFTY
- Devious attempt to get hold of one newspaper
- Modest housing provided on time? Dubious
- Throw about twelve inches underhand
- Your leader supports action to make capital that’s dubious
- Reticent about two newspapers appearing evasive
- Dodgy start taking Independent newspaper
- Evasive leader of youths following spell at work
- Tricky period in which to work before end of day
- Furtive and hesitant taking Independent newspaper
- Slippery fish cooked on banks of Tay
Buddy explains!

The straight part
We know that "underhand" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case underhand = shifty.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 SHIFTY mean?
SHIFTY adjective- Subject to frequent changes in direction.
- (of a person's eyes) Moving from one object to another, not looking directly and steadily at the person with whom one is speaking.
- Having the appearance of being dishonest, criminal or unreliable.
- Resourceful; full of, or ready with, shifts or expedients.