Element of technical language judge dismissed (5)
I believe the answer is:
argon
'element' is the definition.
(argon is a chemical element)
'technical language judge dismissed' is the wordplay.
'technical language' becomes 'jargon' (I've seen this before).
'judge' becomes 'J' (abbreviation for judge).
'dismissed' indicates named letters should be taken away.
'jargon' with 'j' taken away is 'ARGON'.
'of' is the link.
(Other definitions for argon that I've seen before include "Gas, 1% of atmosphere" , "17 [GAS]" , "Inert gas used in light bulbs" , "something inert and insubstantial" , "Gaseous element" .)