Egg on something explosive (5)
I believe the answer is:
nitre
'explosive' is the definition.
(I've seen this before)
'egg on' is the wordplay.
'egg' becomes 'nit' (a nit is an insect egg).
'on' becomes 're' ('on' can be mean 'with reference to').
'nit'+'re'='NITRE'
'something' is the link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for nitre that I've seen before include "Inert (anag) - saltpetre" , "Salt" , "Chemical" , "Also known as salt-petre" , "A part of fertilizer" .)