Place where cap knocked from toy (3)
I believe the answer is:
lay
'place' is the definition.
(I know that place can be written as lay)
'where cap knocked from toy' is the wordplay.
'where cap knocked from' means to remove the first letter (the top letter or 'cap' is removed).
'toy' becomes 'play' (synonyms).
'play' with its first letter removed is 'LAY'.
(Other definitions for lay that I've seen before include "Not professional" , "Song-ballad" , "like a minister? On the contrary" , "Not a religious" , "Non-professional - ballad" .)