Silly to continue (4)
I believe the answer is:
goon
'silly' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'to continue' is the wordplay.
'to' becomes 'go' (I can't explain this - if you can you should believe this answer much more).
'continue' becomes 'on' (I've seen this in other clues).
'go'+'on'='GOON'
Can you help me to learn more?
(Other definitions for goon that I've seen before include "SPIKE] ?" , "Hired thug" , "Stupid person" , "Silly person - bully (US)" , "someone rather stupid" .)