Like mice and men (6)
I believe the answer is:
plural
'like mice and men' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for plural that I've seen before include "Word form denoting more than one is involved" , "Word ending in 'L' for words ending in 'S'?" , "Denotes more than one" , "More than onefold" , "Consisting of more than one" .)