Flag of the state founder, a six-footer (7)
I believe the answer is:
pennant
'flag' is the definition.
(I know that pennant is a type of flag)
'state founder a six-footer' is the wordplay.
'state founder' becomes 'penn' (I've seen this in another clue).
'a six footer' becomes 'ant' (an ant has six feet).
'penn'+'ant'='PENNANT'
'of the' is the link.
(Other definitions for pennant that I've seen before include "Triangular flag" , "Standard" , "Banner" , "Long narrow flag" , "Tapering flag" .)