Display in abundance (4)
I believe the answer is:
ooze
'display in abundance' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ooze that I've seen before include "Trickle slowly out, like mud" , "nap" , "Exude mud" , "Mud at bottom of river" , "Leak viscous matter" .)