Until eventually getting slate (4)
I believe the answer is:
tile
'slate' is the definition.
(thesaurus)
'until eventually' is the wordplay.
'TILE' is hidden within the letters.
But, I am unsure how the hidden word is indicated.
'getting' is the link.
Can you help me to learn more?
(Other definitions for tile that I've seen before include "Thin slab used to cover roof, wall, floor etc" , "Small slab of baked clay for covering walls, roofs etc" , "Flat piece of ceramic" , "Mah-jong piece" , "Oblong piece of glazed clay for bathroom wall" .)