"Origins of Biological Evolution" - lecturer is sound (3)
I believe the answer is:
bel
'sound' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'origins of biological evolution lecturer' is the wordplay.
'origins of' suggests taking the first letters.
The first letters of 'biological evolution lecturer' is 'BEL'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for bel that I've seen before include "Babylonian god" , "starts apocryphal work" , "Unit of volume" , "Unit relating to sound intensity" , "Some noise" .)