Supportive of

FOR

Think of the two-letter word you’d use to show agreement or endorsement in a vote or debate.

The clue "Supportive of" is a straightforward definition hinting at a short word meaning in favor of something. "For" fits perfectly because it’s a preposition that directly expresses support or agreement, like being "for" a cause or idea. There’s no hidden wordplay here—just a simple, direct connection between the clue and the answer.