Come out and call back at a quarter past (7)
I believe the answer is:
emanate
'come out' is the definition.
(I've seen this in another clue)
'call back at a quarter past' is the wordplay.
'call' becomes 'name' (as in calling or naming someone something).
'back' says the letters should be written in reverse.
'a quarter past' becomes 'e' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'name' written backwards gives 'eman'.
'eman'+'at'+'e'='EMANATE'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for emanate that I've seen before include "Emerge or originate" , "Rise" , "Proceed or issue forth" , "Give out, emit" , "Come out (of source)" .)