Visual representation that is covering magazine (5)
I believe the answer is:
image
'visual representation' is the definition.
(I've seen this before)
'that is covering magazine' is the wordplay.
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
'covering' means one lot of letters goes inside another.
'magazine' becomes 'mag' (abbreviation for magazine).
'ie' going around 'mag' is 'IMAGE'.
(Other definitions for image that I've seen before include "Figure (of speech?)" , "Pictorial representation" , "Purplish pigment; pool" , "Picture; simile" , "Epitome" .)