Crossword Genius

Freak out and stare with mouth open over nothing (2,3)

Ross

I believe the answer is:

go ape

'freak out' is the definition.
(thesaurus)

'stare with mouth open over nothing' is the wordplay.
'stare with mouth open' becomes 'gape' (I've seen this before).
'over' means one lot of letters goes inside another.
'nothing' becomes 'o' (looks like zero - 0).
'gape' going around 'o' is 'GO APE'.

'and' acts as a link.

(Another definition for go ape that I've seen is " Throw a wobbly".)

I've seen this clue in The Telegraph.
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