Other people finally moving hither (6)
I believe the answer is:
hereto
'hither' is the definition.
(thesaurus)
'other people finally moving' is the wordplay.
'finally' says to take the final letters.
'moving' indicates anagramming the letters (letters are moved around).
The last letter of 'people' is 'e'.
'other'+'e'='othere'
'othere' anagrammed gives 'HERETO'.
(Other definitions for hereto that I've seen before include "To this place or time" , "(Appended) to this document" , "Attached to this document, legal term" , "to this matter" , "The ore (anag)" .)