What does the cryptic crossword clue "Almost every tree is growing at high altitudes (6)" mean?

The definition is "Almost". The wordplay uses a charade (building blocks). AL (synonym="AL") + PINE (synonym="PINE") = ALPINE The answer is ALPINE.

Almost every tree is growing at high altitudes (6)

Guardian Cryptic #29463 | 19 Down | 2024-08-16 flower