Queen's mate cheated, taking queen in (5)
I believe the answer is:
drone
'queen's mate' is the definition.
(I've seen this before)
'cheated taking queen in' is the wordplay.
'cheated' becomes 'done'.
'taking queen' becomes 'r' (r is abbreviation regina. e.g. in ER . I am not sure about the 'taking' bit.).
'in' means one lot of letters goes inside another.
'done' enclosing 'r' is 'DRONE'.
Can you help me to learn more?
(Other definitions for drone that I've seen before include "Remote controlled aircraft" , "He buzzes, but not with energy!" , "Unmanned aircraft" , "he gives us a buzz" , "mollusc" .)