Flier allowed to follow flea all over the place (7)
I believe the answer is:
leaflet
'flier' is the definition.
(thesaurus)
'allowed to follow flea all over the place' is the wordplay.
'allowed' becomes 'let' (I've seen this before).
'to follow' means one lot of letters go next to another.
'all over the place' is an anagram indicator.
'flea' with letters rearranged gives 'leaf'.
'let' after 'leaf' is 'LEAFLET'.
(Other definitions for leaflet that I've seen before include "All feet (anag)" , "little advertising!" , "Tract" , "Flyer, bill" , "Bill, pamphlet" .)