Crossword Genius

Where informal expressions found to align with Syrian code, oddly translated (5,10)

Ross

I believe the answer is:

slang dictionary

'where informal expressions found' is the definition.
(a slang dictionary lists slang expressions)

'to align with syrian code oddly translated' is the wordplay.
'with' is a charade indicator (letters next to each other).
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
'translated' indicates anagramming the letters.
The alternate letters of 'code' are 'cd'.
'to'+'align'+'syrian'+'cd'='toalignsyriancd'
'toalignsyriancd' is an anagram of 'SLANG DICTIONARY'.

I've seen this clue in The Guardian.
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