Crossword Genius

Bird devouring a little green creature? (7)

Ross

I believe the answer is:

martian

I'm a little stuck... Click here to teach me more about this clue!

'little green creature?' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'bird devouring a' is the wordplay.
'bird' becomes 'martin' (martin is a kind of bird).
'devouring' is an insertion indicator.
'martin' enclosing 'a' is 'MARTIAN'.

Can you help me to learn more?

(Other definitions for martian that I've seen before include "Being from another planet" , "seeing little green man?" , "One living on red planet" , "Relating to one planet" , "Green man from the Red Planet" .)

I've seen this clue in The Independent.
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