People who might make grand arrival? (6)
I believe the answer is:
gentry
'people' is the definition.
(upper-class people)
'grand arrival?' is the wordplay.
'grand' becomes 'G' (G is short for ground as in a thousand).
'arrival?' becomes 'entry' (entry is a kind of arrival).
'g'+'entry'='GENTRY'
'who might make' is the link.
(Other definitions for gentry that I've seen before include "cream?" , "Folk, often upper class" , "aristocrats" , "Folk of high social status" , "People of good breeding" .)