Centenarian leader and topless coquette don't do it any more! (5)
I believe the answer is:
cease
'don't do it any more' is the definition.
I can't tell whether this defines the answer.
'centenarian leader and topless coquette' is the wordplay.
'leader' suggests taking the first letters.
'and' is a charade indicator (letters next to each other).
'topless' means to remove the first letter.
'coquette' becomes 'tease' (I've seen this in another clue).
The initial letter of 'centenarian' is 'c'.
'tease' with its first letter removed is 'ease'.
'c'+'ease'='CEASE'
Can you help me to learn more?
(Other definitions for cease that I've seen before include "Come to an end" , "Stop, finish" , "Culminate" , "Stop, give over" , "Stop, terminate" .)