Crossword Genius

Photo-sharing app popular with 50% of stars (5)

Ross

I believe the answer is:

insta

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'photo-sharing app' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'popular with 50% of stars' is the wordplay.
'popular' becomes 'ita' (I can't justify this - if you can you should believe this answer much more).
'with' indicates putting letters inside.
'50% of' indicates taking half.
'stars' becomes 'suns' (sun is a type of star).
'suns' halved is 'ns'.
'ita' enclosing 'ns' is 'INSTA'.

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I've seen this clue in The Times.
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