The English let off steam at a festival (5)
I believe the answer is:
event
'a festival' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?
'the english let off steam' is the wordplay.
'the english' becomes 'E' (abbreviation).
'let off steam' becomes 'vent' (both can mean to release anger).
'e'+'vent'='EVENT'
'at' acts as a link.
Can you help me to learn more?
(Other definitions for event that I've seen before include "Something that happens - part of a programme?" , "Occasion; sports contest" , "Notable occasion" , "long jump, say" , "Happening, incident" .)