Stone tool in hotel ground (7)
I believe the answer is:
neolith
'stone tool' is the definition.
(I've seen this before)
'in hotel ground' is the wordplay.
'ground' indicates an anagram ('grind' the letters into a new form).
'in'+'hotel'='inhotel'
'inhotel' with letters rearranged gives 'NEOLITH'.
(Other definitions for neolith that I've seen before include "Prehistoric stone tool - hotline (anag)" , "Stone Age artefact" , "Old stone tool" , "Primitive stone implement" , "Ancient stone implement" .)