Signal gets half-confused on river (7)
I believe the answer is:
gesture
'signal' is the definition.
(gesture is a kind of signal)
'gets half-confused on river' is the wordplay.
'half-confused' indicates anagramming the letters (half of the letters are anagrammed).
'on' says to put letters next to each other.
'river' becomes 'ure' (river in Yorkshire).
'gets' anagrammed gives 'gest'.
'gest'+'ure'='GESTURE'
(Other definitions for gesture that I've seen before include "Movement, indication" , "A physical motion or signal" , "Expressive physical movement" , "Message through movement" , "Significant movement" .)