US state I saw under bridge (11)
I believe the answer is:
connecticut
'us state' is the definition.
(I've seen this before)
'i saw under bridge' is the wordplay.
'saw' becomes 'cut' (I've seen this before).
'under' says to put letters next to each other.
'bridge' becomes 'connect'.
'i'+'cut'='icut'
'icut' after 'connect' is 'CONNECTICUT'.
(Other definitions for connecticut that I've seen before include "The Nutmeg State" , "one of fifty" , "Yale U. is in this US state" , "America" , "One of original thirteen US states" .)