Dashing CGI rep set off to show them how text and images would be laid out (7,6)
I believe the answer is:
graphic design
'to show them how text and images would be laid out' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'dashing cgi rep set' is the wordplay.
'set' indicates an anagram (instruction to set the letters).
'dashing'+'cgi'+'rep'='dashingcgirep'
'dashingcgirep' anagrammed gives 'GRAPHIC DESIGN'.
'off' acts as a link.
Can you help me to learn more?
(Another definition for graphic design that I've seen is " Process combining text and visuals for effect or communication".)