Cryptic crossword clue
Good source of energy alternative — fellow briefly giving its description? 10

The most common and most likely answer to this crossword clue is the 10 letter word GEOTHERMAL

I've seen this crossword clue in The Guardian
G
E
O
T
H
E
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M
A
L

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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 GEOTHERMAL mean?

GEOTHERMAL adjective
  1. Pertaining to heat energy extracted from reservoirs in the earth's interior

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