Crossword Genius

Slope in squiggly foreign letter (7)

Ross

I believe the answer is:

epsilon

'foreign letter' is the definition.
(letter of the Greek alphabet)

'slope in squiggly' is the wordplay.
'squiggly' indicates anagramming the letters.
'slope'+'in'='slopein'
'slopein' is an anagram of 'EPSILON'.

(Other definitions for epsilon that I've seen before include "Greek character" , "One's lip (anag)" , "Fifth brightest star in a constellation" , "Greek letter E" , "Greek short E" .)

I've seen this clue in The Telegraph.
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