Risk of grenade exploding holding end of pin (8)
I believe the answer is:
endanger
'risk' is the definition.
(thesaurus)
'grenade exploding holding end of pin' is the wordplay.
'exploding' indicates an anagram.
'holding' means one lot of letters goes inside another.
'end of' suggests the final letters.
The final letter of 'pin' is 'n'.
'grenade' is an anagram of 'endager'.
'endager' enclosing 'n' is 'ENDANGER'.
'of' is the link.
(Other definitions for endanger that I've seen before include "Hazard" , "compromise" , "Imperil" , "Put someone at risk" , "Place into peril, jeopardise" .)