Crossword Genius

Singer ending in Detroit inspired by song that's out of this world? (5,3)

Ross

I believe the answer is:

marsh tit

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

'singer ending in detroit inspired by song that's out of this world?' is the definition.
The definition suggests a singular noun which matches the answer.

'this world?' is the wordplay.
I cannot really see how this works, but
an anagram of 'this' is 'shti' which is within the answer.
The remaining letters 'mart' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for marsh tit that I've seen before include "Eurasian songbird - trims hat (anag)" , "bird" .)

I've seen this clue in The Guardian.
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