Occasionally vulgar, essentially tricky languages (5)

I believe the answer is:

ugric

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'occasionally vulgar essentially tricky languages' is the definition.
I can't tell whether this definition defines the answer.

'occasionally vulgar essentially tricky' is the wordplay.
'occasionally' means one should take alternating letters (letters taken at regular intervals or occasions).
'essentially' means to look at the middle letters.
The centre of 'tricky' is 'ic'.
The alternate letters of 'vulgar' are 'ugr'.
'ugr'+'ic'='UGRIC'

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(Other definitions for ugric that I've seen before include "Type of language" , "Language family" , "tongue" .)

I've seen this clue in The Guardian.

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