Six balls wife initially hooked with wood in golf -- mind-boggling! (12)
I believe the answer is:
overwhelming
'mind-boggling' is the definition.
(thesaurus)
'six balls wife initially hooked with wood in golf' is the wordplay.
'six balls' becomes 'over' (sequence of six balls bowled in cricket).
'wife' becomes 'w'.
'initially' says to take the initial letters.
'with wood' becomes 'elm' (elm is a kind of wood. I am not sure about the 'with' bit.).
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
The first letter of 'hooked' is 'h'.
'over'+'w'+'h'+'elm'+'in'+'g'='OVERWHELMING'
Can you help me to learn more?
(Other definitions for overwhelming that I've seen before include "Completely overpowering" , "Crushing" , "Completely defeating" , "Irresistible -- huge" .)