Chance with American brochure (10)
I believe the answer is:
prospectus
'brochure' is the definition.
(I've seen this before)
'chance with american' is the wordplay.
'chance' becomes 'prospect' (I've seen this before).
'with' means one lot of letters go next to another.
'american' becomes 'US' (United States).
'prospect'+'us'='PROSPECTUS'
(Other definitions for prospectus that I've seen before include "Programme" , "Advertising booklet for school or university" , "University entering opportunities for success in brochure" , "Booklet of what's on offer" , "Brochure giving details of college courses etc" .)