Mysterious spell in game leads to Navarro’s exit (4)
I believe the answer is:
rune
'mysterious spell' is the definition.
'rune' can be an answer for 'spell' (I've seen this before). I am unsure of the 'mysterious' bit.
'game leads to navarro's exit' is the wordplay.
'game' becomes 'RU' (rugby union).
'leads to' indicates taking the first letters.
The initial letters of 'navarros exit' is 'ne'.
'ru'+'ne'='RUNE'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for rune that I've seen before include "Ancient symbol" , "Mystical symbol" , "Ancient character" , "Old Scandinavian letter" , "Spell" .)