Why I get confused is significant (7)
I believe the answer is:
weighty
'significant' is the definition.
(I've seen this before)
'why i get confused' is the wordplay.
'confused' indicates anagramming the letters.
'why'+'i'+'get'='whyiget'
'whyiget' with letters rearranged gives 'WEIGHTY'.
'is' is the link.
(Other definitions for weighty that I've seen before include "Important" , "Cumbersome" , "Heavy - very serious" , "significant" , "substantial" .)