Henry, turning up, eggs on Charlie to create chaos (5)
I believe the answer is:
havoc
'chaos' is the definition.
(I've seen this before)
'henry turning up eggs on charlie' is the wordplay.
'henry' becomes 'H' (symbol for the unit of electrical inductance).
'turning up' says the letters should be written in reverse.
'eggs' becomes 'ova' (term for egg cells).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'charlie' becomes 'C' (phonetic alphabet: alpha, bravo, charlie etc.).
'ova' backwards is 'avo'.
'h'+'avo'+'c'='HAVOC'
'to create' acts as a link.
(Other definitions for havoc that I've seen before include "Carnage" , "Ruin" , "Total destruction" , "Widepsread destruction" , "Disaster" .)