Guest argues periodically for enjoyment (5)
I believe the answer is:
usage
'enjoyment' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe there's a link between them I don't understand?
'guest argues periodically' is the wordplay.
'periodically' means one should take alternating letters (letters must be selected 'every so often').
'guest'+'argues'='guestargues'
The alternating letters of 'guestargues' are 'USAGE'.
'for' is the link.
Can you help me to learn more?
(Other definitions for usage that I've seen before include "Usual practice" , "Silly little thing" , "Customary practice" , "Way of treating" , "Custom - treatment" .)