At half fare, ten can be sent (3)
I believe the answer is:
fax
'be sent' is the definition.
I can't tell whether this defines the answer.
'at half fare ten' is the wordplay.
'at' says to put letters next to each other.
'half' indicates taking half.
'ten' becomes 'X' (Roman numeral).
'fare' cut in half is 'fa'.
'fa' next to 'x' is 'FAX'.
'can' acts as a link.
Can you help me to learn more?
(Other definitions for fax that I've seen before include "Means of communication" , "Transmission of exact copies of documents electronically" , "Electronic transmission" , "Transmit document" , "Modern method of transmitting printed matter by phone" .)