Cryptic crossword clue
Luminance being admitted rescues towering rainforests 6

The most common and most likely answer to this crossword clue is the 6 letter word SELVAS

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Buddy explains!

The straight part
We know that "rainforests" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rainforests = selvas.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does SELVAS mean?

SELVAS noun
  1. Heavily forested ground in the Amazon basin.

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