Crown of Henry VIII (6)
I believe the answer is:
height
'crown' is the definition.
(thesaurus)
'henry viii' is the wordplay.
'henry' becomes 'H' (symbol for the unit of electrical inductance).
'viii' becomes 'eight' (synonyms).
'h'+'eight'='HEIGHT'
'of' is the link.
(Other definitions for height that I've seen before include "Dimension from top to bottom" , "part of a patient's statistics?" , "Crowning moment" , "Vertical extent" , "summit" .)