On one's own (5)
There are a few possibilities for this:
'on one's own' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for alone that I've seen before include "Solo" , "Exclusively; solitary" , "without partner?" , "Isolated; exclusively" , "Lacking company, solitary" .)
(Other definitions for unattended that I've seen before include "not taking train" , "Not looked after" .)
(Other definitions for independently that I've seen before include "without the help of others" , "Alone and unaided" .)
(Other definitions for solo that I've seen before include "Game for four" , "Performed by a single voice or instrument" , "Whist variant" , "Performance by one person" , "Alone, unaccompanied" .)
(Another definition for singlehanded that I've seen is " alone".)
(Other definitions for tod that I've seen before include "Former English weight for wool - dot it" , "One's alone on this" , "Fox" , "If you're on it, you're on your own" , "Sly person" .)
'on one's own' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for solo that I've seen before include "Unaccompanied - card game" , "Fly aircraft" , "Han - (Star Wars); fly unaccompanied" , "Aline in Oslo" , "Alone, unaccompanied" .)
(Other definitions for outright that I've seen before include "Completely and thoroughly" , "Unreservedly" , "Openly and frankly" , "Complete; immediately" , "straight away" .)