What does the cryptic crossword clue "Bucks? A different county, we understand (5)" mean?

The definition is "Bucks?". The wordplay uses a homophone (sounds like). sounds like “Herts” (a different county). The answer is HARTS.

Bucks? A different county, we understand (5)

Times Cryptic #28871 | 7 Down | 2024-03-22 flower