Teresa refreshed by spring holiday (6)
I believe the answer is:
easter
'spring holiday' is the definition.
'easter' can be an answer for 'holiday' (I've seen this before). I'm not sure about the 'spring' bit.
'teresa refreshed' is the wordplay.
'refreshed' indicates anagramming the letters.
'teresa' with letters rearranged gives 'EASTER'.
'by' acts as a link.
Can you help me to learn more?
(Other definitions for easter that I've seen before include "Christian celebration for Teresa" , "Time to celebrate" , "Snug retreat" , "Teaser about Christian festival" , "Christian festival in Spring" .)