Get to assemble (6)
I believe the answer is:
gather
This clue is a double definition.
'get' is the first definition.
(thesaurus)
'assemble' is the second definition.
('gather' can be a synonym of 'assemble')
'to' acts as a link.
(Other definitions for gather that I've seen before include "Bring or assemble together" , "Assemble or glean" , "Bring or come together in one place" , "Accumulate, garner" , "Get together" .)