Enlisted (5,2)
'enlisted' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for roped in that I've seen before include "Unwillingly involved in" , "Obliged to participate" , "Persuaded to join" , "like boxers after entering the ring?" , "reluctantly enlisted" .)
(Other definitions for registered that I've seen before include "indicated" , "Sunk in" , "as post may be" , "Recorded in writing" , "Recorded; expressed (an opinion)" .)