What does the cryptic crossword clue "Pliant mountaineer maybe heading off (6)" mean?

The definition is "Pliant". The wordplay uses acrostic. LIMBER (deletion) = LIMBER; definition: "Pliant" The answer is LIMBER.

Pliant mountaineer maybe heading off (6)

Guardian Cryptic #29537 | 21 Down | 2024-11-11 flower