First to talk about doctor with light that shivered (8)
I believe the answer is:
trembled
'that shivered' is the definition.
(I've seen this before)
'first to talk about doctor with light' is the wordplay.
I cannot quite understand how this works, but
'about' could be 're' ('re' means regarding or about) and 're' is found in the answer.
'doctor' could be 'mb' (Bachelor of Medicine, Medicinae Baccalaureus) and 'mb' is found in the answer.
'light' could be 'led' (light-emitting diode) and 'led' is located in the answer.
'first to' could be 't' (1st letter of 'to') and 't' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for trembled that I've seen before include "Shook involuntarily" , "Shook from fear or cold" , "shivered" .)