Amazing area you and I associated with an unspecified number (7)
I believe the answer is:
awesome
'amazing' is the definition.
(synonyms)
'area you and i associated with an unspecified number' is the wordplay.
'area' becomes 'a' (maths abbreviation).
'you and i' becomes 'we' (we means you and I).
'associated with' means one lot of letters go next to another.
'an unspecified number' becomes 'some' (I've seen this before).
'a'+'we'+'some'='AWESOME'
(Other definitions for awesome that I've seen before include "Inspiring reverential respect" , "Simultaneously wonderful" , "Inspiring fear/wonder" , "Causing great wonder" , "Terrific" .)