Row of seats in circle section (8)
I believe the answer is:
ringside
'row of seats' is the definition.
(seats nearest to a boxing ring)
'circle section' is the wordplay.
'circle' becomes 'ring' (synonyms).
'section' becomes 'side' ().
'ring'+'side'='RINGSIDE'
'in' is the link.
(Other definitions for ringside that I've seen before include "Location of best seats at boxing match" , "where people come close to fighting" , "position near competition arena" , "where there's a good view" , "good seats" .)