Similarly, purchase an identical disc on the phone (2,3,4,5)
I believe the answer is:
by the same token
'similarly' is the definition.
(I've seen this before)
'purchase an identical disc on the phone' is the wordplay.
I cannot really see how this works, but
'an' could be 'a' and 'a' is located in the answer.
'disc' could be 'token' (token is a kind of disc) and 'token' is found within the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for by the same token that I've seen before include "... Moreover" , "How similar bargains may be secured" , "Subject to its value" , "For the identical reason" , "how books may be bought in addition?" .)