Language of Conservative occasionally we'd let rip about (6)
I believe the answer is:
celtic
'language' is the definition.
(Celtic is an example)
'conservative occasionally we'd let rip about' is the wordplay.
'conservative' becomes 'C' (UK political abbreviation).
'occasionally' means one should take alternating letters (letters taken at regular intervals or occasions).
'about' becomes 'c' (abbreviation for 'circa').
'wed'+'let'+'rip'='wedletrip'
The alternate letters of 'wedletrip' are 'elti'.
'c'+'elti'+'c'='CELTIC'
'of' acts as a link.
(Other definitions for celtic that I've seen before include "This tiger is credited with Irish prosperity" , "Like, eg, Welsh, Gaelic" , "Group of languages including Irish, Welsh, etc" , "The Irish are part of the race" , "Language group including Manx" .)