Crowds having a bit of fun during May (4)
I believe the answer is:
many
'crowds having a bit' is the definition.
I can't tell whether this defines the answer.
'fun during may' is the wordplay.
'fun' becomes 'n' (I can't explain this - if you can you should believe this answer much more).
'during' indicates putting letters inside.
'n' put into 'may' is 'MANY'.
'of' is the link.
Can you help me to learn more?
(Other definitions for many that I've seen before include "multitude" , "Several" , "regarded as a large number" , "Numerous" , "Multitudinous" .)