Sure get confused by signal (7)
I believe the answer is:
gesture
'signal' is the definition.
(gesture is a kind of signal)
'sure get confused' is the wordplay.
'confused' is an anagram indicator.
'sure'+'get'='sureget'
'sureget' is an anagram of 'GESTURE'.
'by' acts as a link.
(Other definitions for gesture that I've seen before include "Gesticulate, sign" , "Hand movement to communicate" , "Expressive arm movement" , "Meaningful hand or head movement" , "Sign with the hand" .)