Pass, as yet unsettled about assistants (8)
I believe the answer is:
acolytes
'assistants' is the definition.
(acolyte is a kind of assistant)
'pass as yet unsettled about' is the wordplay.
'pass' becomes 'col' (col is a term for a mountain pass).
'unsettled' is an anagram indicator.
'about' indicates putting letters inside.
'as'+'yet'='asyet'
'asyet' is an anagram of 'aytes'.
'col' inserted inside 'aytes' is 'ACOLYTES'.
(Other definitions for acolytes that I've seen before include "They assist the clergy in liturgical services" , "Assistants or attendants" , "They assist priests in services" , "Cosy tale (anag) - followers" , "They assist priests or ministers in liturgical service" .)