The most common and most likely answer to this crossword clue is the 6 letter word PAYERS
I've seen this crossword clue in The Guardian
P
A
Y
E
R
S
More clues leading to the result PAYERS
Buddy explains!

The straight part
We know that "They may subsidise" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they may subsidise = payers.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 PAYERS mean?
PAYERS noun- One who pays; specifically, the person by whom a bill or note has been, or should be, paid.
- A swaption which gives its holder the option to enter into a swap in which they pay the fixed leg and receive the floating leg.