Express feelings when book is brought up by sweetheart (5)
I believe the answer is:
emote
'express feelings' is the definition.
(I've seen this in another clue)
'book is brought up by sweetheart' is the wordplay.
'book' becomes 'tome' (a tome is a book).
'is brought up' says the letters should be written backwards (in a down clue, letters go up).
'by sweetheart' becomes 'e' (the middle letter or heart of 'sweet'. I am not sure about the 'by' bit.).
'tome' back-to-front is 'emot'.
'emot'+'e'='EMOTE'
'when' acts as a link.
Can you help me to learn more?
(Other definitions for emote that I've seen before include "Portray feelings theatrically" , "Show feelings excessively" , "Run away" , "Express over-the-top feelings" , "Show strong feeling" .)