Entranced by time before spring (10)
I believe the answer is:
spellbound
'entranced' is the definition.
('spellbind' can be a synonym of 'entrance')
'by time before spring' is the wordplay.
'by time' becomes 'spell' (I've seen this before. I am not sure about the 'by' bit.**).
'before' is a charade indicator (letters next to each other).
'spring' becomes 'bound' (bounding is a kind of springing).
'spell'+'bound'='SPELLBOUND'
Can you help me to learn more?
(Other definitions for spellbound that I've seen before include "Transfixed, mesmerised" , "Captivated" , "Entranced" , "frozen" , "attending solidly" .)