Outside edges around feet of creatures (4)
I believe the answer is:
efts
'creatures' is the definition.
(eft is a kind of creature)
'outside edges around feet' is the wordplay.
'outside' says to hollow out the word (remove centre letters) (I've seen 'outside of' mean this).
'around' means one lot of letters goes inside another.
'feet' becomes 'ft' (I've seen this in other clues).
'edges' with its middle removed is 'es'.
'es' going around 'ft' is 'EFTS'.
'of' acts as a link.
(Other definitions for efts that I've seen before include "Kind of newts" , "Baby newts" , "Amphibians" , "Old lizards" .)