Common verb (3)
I believe the answer is:
are
'common verb' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for are that I've seen before include "Era (anag.)" , "(They/you/we) exist" , "is for more than one" , "Exist; square measure" , "Unit of land measure equal to 100 square metres" .)