What does the cryptic crossword clue "Catch mate briefly on the way up (6)" mean?

The definition is "Catch". The wordplay uses a reversal. PARTNE (reversal="PARTNE") = ENTRAP; definition: "Catch" The answer is ENTRAP.

Catch mate briefly on the way up (6)

Guardian Cryptic #29233 | 2 Down | 2023-11-21 flower