Wild apes can be identical twins! (4)
I believe the answer is:
peas
'identical twins' is the definition.
Although both the answer and definition are plural nouns, I can't see how one could define the other.
'wild apes' is the wordplay.
'wild' is an anagram indicator.
'apes' is an anagram of 'PEAS'.
'can be' acts as a link.
Can you help me to learn more?
(Other definitions for peas that I've seen before include "Leguminous plants" , "Seeded vegetables" , "Leguminous seeds" , "Podded vegetables" , "Vegetables from pods" .)
