Hotel covered by flashy drone (5)
I believe the answer is:
hydro
'hotel' is the definition.
(I've seen this in other clues)
'covered by flashy drone' is the wordplay.
'covered by' says the answer is hidden in the clue.
'HYDRO' is hidden in the letters of 'flashy drone'.
(Other definitions for hydro that I've seen before include "spa town" , "spa resort" , "Prefix meaning water, or spa hotel" , "Spa treatment 46 ac" , "Prefix indicating water" .)