Crossword Genius

Outstanding alien sitting in middle of street (7)

Ross

I believe the answer is:

salient

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'outstanding' is the definition.
(synonyms)

'alien sitting in middle of street' is the wordplay.
'sitting in' is an insertion indicator.
'middle of street' becomes 'st' (I can't justify this - if you can you should give a lot more credence to this answer).
'alien' put into 'st' is 'SALIENT'.

Can you help me to learn more?

(Other definitions for salient that I've seen before include "Prominent - in tales (anag)" , "Entails being most noticeable" , "Noteworthy" , "Entails (anag) - most important" , "Leaping (heraldry)" .)

I've seen this clue in the Sydney Morning Herald.
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