What does the cryptic crossword clue "Isolated high point providing some satisfaction, but only some (4)" mean?

The wordplay uses a container (one word inside another). ME (synonym="ME") + SA (synonym="SA") = MESA The answer is MESA.

Isolated high point providing some satisfaction, but only some (4)

Guardian Cryptic #29212 | 10 Across | 2023-10-27 flower