Cryptic crossword clue
Mars is source of deposits especially fossil fuels 8

The most common and most likely answer to this crossword clue is the 8 letter word DESPOILS

D
E
S
P
O
I
L
S

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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 DESPOILS mean?

DESPOILS verb
  1. To plunder; to pillage; take spoil from.
  2. To violently strip (someone), with indirect object of their possessions etc.; to rob.
  3. To strip (someone) of their clothes; to undress.

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