Records what's essentially sent from pulsar (6)
I believe the answer is:
enrols
'records' is the definition.
Although both the answer and definition are verbs in their -s form, I can't see how one could define the other.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for enrols that I've seen before include "Registers as a member" , "Joins up, signs on" , "Enters on a list" , "recruits" , "Enlists" .)