Toecap regularly scratched some games in tennis service (3,3)
'tennis service' is the definition.
'tea set' can be an answer for 'service' (I've seen this before). I am not sure about the 'tennis' bit.
'toecap regularly scratched some games' is the wordplay.
'regularly scratched' means one should take alternating letters (letters removed or scratched at regular intervals).
'some games' becomes 'set' (I have seen 'games of tennis' mean 'set' so perhaps 'games' could also mean 'set').
The alternating letters of 'toecap' are 'tea'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for tea set that I've seen before include "hot drink service", "Crockery service", "Collections of cups, saucers etc for serving light meal", "tableware", "Matching plates, cups, etc".)