Hard copy of advertising by popular solicitor (8)
I believe the answer is:
printout
'hard copy' is the definition.
(thesaurus)
'advertising by popular solicitor' is the wordplay.
'advertising' becomes 'PR' (public relations).
'by' means one lot of letters go next to another.
'popular' becomes 'in' ('in' can mean trendy).
'solicitor' becomes 'tout' (someone who solicits business).
'pr'+'in'+'tout'='PRINTOUT'
'of' acts as a link.
(Other definitions for printout that I've seen before include "Page(s) produced from a computer" , "data, on paper" .)