Three left hotel, spruce (4)
I believe the answer is:
tree
'spruce' is the definition.
(thesaurus)
'three left hotel' is the wordplay.
'left' suggests deleting specific letters.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'three' with 'h' removed is 'TREE'.
(Other definitions for tree that I've seen before include "Plane perhaps" , "Forest plant" , "Maybe plane" , "Plane possibly" , "Shoe __ or family __" .)