Reckoned on audio caller (5)
I believe the answer is:
guest
'caller' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for guest that I've seen before include "Conjectured audibly" , "Someone invited" , "company" , "Person entertained by host" , "Customer of a hotel" .)