Walker confused dean and priest (10)
I believe the answer is:
pedestrian
'walker' is the definition.
(I know that walker can be written as pedestrian)
'confused dean and priest' is the wordplay.
'confused' indicates anagramming the letters.
'and' says to put letters next to each other.
'dean' after 'priest' is 'priestdean'.
'priestdean' is an anagram of 'PEDESTRIAN'.
(Other definitions for pedestrian that I've seen before include "Walker; prosaic" , "Hiker" , "Run-of-the mill" , "Dull; walker" , "Unexciting" .)