Fabulous wife, but she just had to run away with a writer! (8)
I believe the answer is:
penelope
'fabulous wife but she just had' is the definition.
I can't judge whether this definition defines the answer.
'run away with a writer' is the wordplay.
'run away' becomes 'elope' (I've seen this in another clue).
'with' is a charade indicator (letters next to each other).
'a writer' becomes 'pen' (something which writes).
'elope' after 'pen' is 'PENELOPE'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for penelope that I've seen before include "girl" , "lady" , "Waiter" , "Ulysses' faithful wife" , "Wife of Odysseus or Ulysses" .)