Risk adding nitrogen to exploding grenade (8)
I believe the answer is:
endanger
'risk' is the definition.
(to risk is to put in danger)
'adding nitrogen to exploding grenade' is the wordplay.
I cannot quite understand how this works, but
'nitrogen' could be 'n' (N is the chemical symbol for nitrogen) and 'n' is located in the answer.
an anagram of 'grenade' is 'edanger' which is present in the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for endanger that I've seen before include "Hazard" , "To put one at risk" , "Put in harm's way" , "Jeopardize" , "Put in jeopardy" .)