Break loose avoiding laser - the one you can buy online (5)
I believe the answer is:
'break loose avoiding laser' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'one you can buy online' is the wordplay.
I cannot quite see how this works, but
'one' could be 'o' (I've seen this in other clues) and 'o' is present in the answer.
'online' could be 'e' (abbreviation for electronic, e.g. in ecommerce) and 'e' is present in the answer.
The remaining letters 'bok' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'the' acts as a link.
Can you help me to learn more?
(Other definitions for e-book that I've seen before include "Electronic reading material" , "Volume in electronic form" , "Non-paper publication" , "Online publication" , "Downloaded volume" .)