Confusion at the first corner (6)
I believe the answer is:
tangle
'confusion' is the definition.
(tangle is a kind of confusion)
'at the first corner' is the wordplay.
'at' means one lot of letters go next to another.
'first' says to take the initial letters.
'corner' becomes 'angle' (I've seen this before).
The initial letter of 'the' is 't'.
't'+'angle' is 'TANGLE'.
(Other definitions for tangle that I've seen before include "'Twisted mess, muddle (6)'" , "Trap < tall guy from Perth" , "Snarl-up" , "Jumble" , "A fight; seaweed" .)