Public perception of glossy publication? That is about it! (5)
I believe the answer is:
image
'public perception' is the definition.
(I've seen this in another clue)
'glossy publication? that is about it' is the wordplay.
'glossy publication?' becomes 'mag' (abbreviation for magazine. I am not sure about the 'glossy' bit.).
'that is' becomes 'ie' (abbreviation for id est, 'that is' in Latin).
'about it' indicates putting letters inside (some letters go around or about others).
'mag' put into 'ie' is 'IMAGE'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for image that I've seen before include "Mental picture; idol" , "Idol; simile" , "Representation, picture" , "Photo or likeness" , "Simile, metaphor" .)