The most common and most likely answer to this crossword clue is the 7 letter word MARTIAN
I've seen this crossword clue in The Daily Telegraph
M
A
R
T
I
A
N
More clues leading to the result MARTIAN
- Where to trade in a mutant for an alien
- Alien craft, one commandeered by humans
- Maid welcomes opening of The Alien
- High-flyer crosses avenue at first green man
- “Alien to spoil it after turning up” – a Nationalist
- Bird eating a little green man?
- Transport returning home carrying advanced alien
- Bird eating a strange creature
- Finish off tamarind paste that’s out of this world
- Skill I found in fellow who supposedly lives in another world?
Buddy explains!
The straight part
We know that "alien" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case alien = martian.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 MARTIAN mean?
MARTIAN adjective- Of or relating to the planet Mars, or its imagined inhabitants.
- Pertaining to the astrological influence of the planet Mars; aggressive, bellicose.
- Pertaining to battle or war; martial, military.