He follows fool in dress (6)
I believe the answer is:
clothe
'dress' is the definition.
(I know that dress can be written as clothe)
'he follows fool' is the wordplay.
'follows' says to put letters next to each other.
'fool' becomes 'clot' (I've seen this in other clues).
'he' put after 'clot' is 'CLOTHE'.
'in' acts as a link.
(Other definitions for clothe that I've seen before include "Provide with garments" , "Put garments onto" , "Provide cover for body and limbs" , "Attire" , "Remote area in Mongolia/China" .)