Time, hour, with former pupil - feel emotion (5)
I believe the answer is:
throb
'feel emotion' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'time hour with former pupil' is the wordplay.
'time' becomes 't' (abbreviation).
'hour' becomes 'hr' (abbreviation).
'with' means one lot of letters go next to another.
'former pupil' becomes 'OB' (abbreviation for 'Old Boy').
't'+'hr'+'ob'='THROB'
Can you help me to learn more?
(Other definitions for throb that I've seen before include "Pulse" , "Beat quickly from excitement etc" , "One's heart may do it" , "Beat like heart" , "Strong regular beat" .)