The most common and most likely answer to this crossword clue is the 6 letter word INSPAN
I
N
S
P
A
N
Buddy explains!

The straight part
We know that "forcibly put to work" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case forcibly put to work = inspan.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 INSPAN mean?
INSPAN verb- To yoke (oxen).
- To bring or force into service.