The most common and most likely answer to this crossword clue is the 6 letter word UNPAID
I've seen this crossword clue in The Daily Telegraph
U
N
P
A
I
D
More clues leading to the result UNPAID
- Like volunteers, give assistance after UN pressure
- Outstanding amateur
- Pun about helper working as a volunteer?
- Honorary penny given in international assistance
- Outstanding university pad in Barking
- Outstanding, a Parisian apartment I secured
- Outstanding power in international humanitarian support?
- A French flat one’s in for free
- . International organisation getting funds after putting pressure, outstanding
- Remaining free
Buddy explains!

The straight part
We know that "Outstanding" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case outstanding = unpaid.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 UNPAID mean?
UNPAID adjective- Not paid for.
- Of work: done without agreed payment, usually voluntarily.