Send for (6)
I believe the answer is:
summon
'send for' is the definition.
(summoning is a kind of sending for)
This is the entire clue.
(Other definitions for summon that I've seen before include "Command to come - to court?" , "Call (a person) to attend" , "Call (people) to attend" , "Convene" , "Call (someone) to attend" .)