Inability to sleep at home as I’m on travels (8)
I believe the answer is:
insomnia
'inability to sleep' is the definition.
(I've seen this before)
'home as i'm on travels' is the wordplay.
'home' becomes 'in' (to be in is to be (at) home).
'travels' indicates anagramming the letters.
'as'+'im'+'on'='asimon'
'asimon' with letters rearranged gives 'somnia'.
'in'+'somnia'='INSOMNIA'
'at' acts as a link.
(Other definitions for insomnia that I've seen before include "Inability to drop off" , "Condition affecting sleep" , "Wakefulness" , "In restless state" , "Not getting off" .)