I turn on stove in the end (3)
I believe the answer is:
ego
'i' is the definition.
(I've seen this in other clues)
'turn on stove in the end' is the wordplay.
'turn' becomes 'go' (a person's move in a board game).
'on' means one lot of letters go next to another.
'in the end' suggests the final letters.
The last letter of 'stove' is 'e'.
'go' put after 'e' is 'EGO'.
(Other definitions for ego that I've seen before include "(Person's) sense of self-esteem" , "Self-esteem or self-importance" , "One's self image" , "Conscious self" , "Personal pride" .)