That is providing cover for Vogue? (5)
I believe the answer is:
image
'vogue?' is the definition.
The definition and answer can be both related to thinking as well as being singular nouns.
Perhaps there's a link between them I don't understand?
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for image that I've seen before include "Simile, metaphor" , "Mental picture; metaphor" , "Vision" , "Picture (involving one letter change from 10)" , "Likeness; statue" .)