Prone (3)
'prone' is the definition.
(synonyms)
This is all the clue.
(Other definitions for prostrate that I've seen before include "Face to the ground" , "Horizontal" , "Totally exhausted" , "Prone" , "Lying stretched out" .)
'prone' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for apt that I've seen before include "Train" , "flat" , "Suitable or likely" , "clever" , "Prone" .)
'prone' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for supine that I've seen before include "Inert; on one's back" , "Lying face upwards, indolent" , "Lying face upward" , "Flat on one's back" , "Use pin (anag.)" .)
'prone' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for liable that I've seen before include "Inclined" , "Subject to an obligation" , "Legally answerable" , "Responsible at law" , "'Responsible, answerable (6)'" .)
'prone' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for face down that I've seen before include "Prone" , "Beard" , "Successfully confront" .)
'prone' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for facedown that I've seen before include "Overcome by bold confident manner" , "Prone" .)