Titanic reportedly swarming with small creatures (4)
I believe the answer is:
mity
'with small creatures' is the definition.
The definition suggests a singular noun which matches the answer.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for mity that I've seen before include "With many little creatures" , "Infested with arachnids" , "Infested with horrible things that are tiny" .)