Go to welcome new court officials and clerks (10)
I believe the answer is:
penpushers
'clerks' is the definition.
(penpusher is a kind of clerk)
'go to welcome new court officials' is the wordplay.
'go' becomes 'pep' (both can mean energy or vitality).
'to welcome' means one lot of letters goes inside another (inserted letters are welcomed in).
'new' becomes 'n' (abbreviation as in New Testament NT).
'court officials' becomes 'ushers' (I've seen this before).
'pep' placed around 'n' is 'penp'.
'penp'+'ushers'='PENPUSHERS'
'and' is the link.
(Another definition for penpushers that I've seen is " Clerks who do boring paperwork".)