Representation in holding company (4)
I believe the answer is:
icon
'representation' is the definition.
(I've seen this before)
'in holding company' is the wordplay.
'holding' is an insertion indicator.
'company' becomes 'co' (abbreviation).
'in' enclosing 'co' is 'ICON'.
(Other definitions for icon that I've seen before include "Admired figure" , "Sacred painting or representative figure" , "Sacred image or picture" , "Image or representation" , "Devotional image (C, not K)" .)