At half fare, ten can be sent (3)
I believe the answer is:
fax
'be sent' is the definition.
I can't judge whether this defines the answer.
'at half fare ten' is the wordplay.
'at' is a charade indicator (letters next to each other).
'half' suggests halving the letters.
'ten' becomes 'X' (Roman numeral).
'fare' with half the letters taken is 'fa'.
'fa' put next to 'x' is 'FAX'.
'can' is the 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" .)