Very quickly showing that they enjoy flashy event (4,9)
I believe the answer is:
like lightning
'very quickly' is the definition.
(I've seen this before)
'that they enjoy flashy event' is the wordplay.
I cannot quite understand how this works, but
'enjoy' could be 'like' (like can mean to appreciate or enjoy something) and 'like' is present in the answer.
'event' could be 'lightning' (lightning is a kind of event) and 'lightning' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'showing' is the link.
Can you help me to learn more?
(Another definition for like lightning that I've seen is " Very quickly".)