Creatures with feet going in two directions (4)
I believe the answer is:
efts
'creatures' is the definition.
(eft is a kind of creature)
'feet going in two directions' is the wordplay.
'two directions' can mean two replacements for 'direction'.
'feet' becomes 'ft' (I've seen this in other clues).
'going in' is an insertion indicator.
'direction' becomes 'E' (E is an example).
'direction' becomes 'S' (S is an example).
'e'+'s'='es'
'ft' put inside 'es' is 'EFTS'.
'with' is the link.
(Other definitions for efts that I've seen before include "Old lizards" , "Baby newts" , "Amphibians" , "Kind of newts" .)