Ground shaky? Retain right? (7)
I believe the answer is:
terrain
'ground' is the definition.
(terrain is land or ground)
'shaky? retain right?' is the wordplay.
'shaky?' indicates anagramming the letters (I've seen 'shaky' mean this).
'right?' becomes 'R' (common abbreviation).
'retain'+'r'='retainr'
'retainr' anagrammed gives 'TERRAIN'.
(Other definitions for terrain that I've seen before include "Stretch of land of a particular sort" , "A stretch of land for trainer" , "Ground - rare tin (anag)" , "Type of countryside" , "Tract of land with particular character" .)