The most common and most likely answer to this crossword clue is the 3 letter word AID
I've seen this crossword clue in The Times
A
I
D
More clues leading to the result AID
- Dry run cancelled — help!
- Help! is rendered without Beatles' finale
- Help! The opera isn’t finished!
- Excellent Duke provides support
- Matilda oddly ignored assistant
- Son has left aforementioned charity
- Help one to be inserted in publicity
- Help female servant male deserted
- Auxiliary note finally omitted from opera
- I’m plugging commercial for disaster relief
Buddy explains!

The straight part
We know that "charity" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case charity = aid.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 AID mean?
AID noun- Help; assistance; succor, relief.
- A helper; an assistant.
- Something which helps; a material source of help.
- An historical subsidy granted to the crown by Parliament for an extraordinary purpose, such as a war effort.
- An exchequer loan.
- A pecuniary tribute paid by a vassal to his feudal lord on special occasions.
- An aide-de-camp, so called by abbreviation.
- To provide support to; to further the progress of; to help; to assist.
- To climb with the use of aids such as pitons.