Don't bother to take a holiday on one's own (5,5)
I believe the answer is:
leave alone
'don't bother' is the definition.
(I've seen this in another clue)
'to take a holiday on one's own' is the wordplay.
'to take' is an insertion indicator (inserted letters are taken in).
'holiday' becomes 'leave' (I've seen this before).
'on one's own' becomes 'lone' (I've seen this in another clue).
'leave'+'lone'='leavelone'
'a' placed inside 'leavelone' is 'LEAVE ALONE'.
(Other definitions for leave alone that I've seen before include "Do not disturb" , "Abandon" .)