Time for leader to wrap up? Nonsense! (7)
I believe the answer is:
twaddle
'nonsense' is the definition.
(informal term for nonsense or rubbish)
'time for leader to wrap up?' is the wordplay.
'time' becomes 't' (abbreviation).
'for' means one lot of letters go next to another.
'leader to' says to take the initial letters (the letter which leads the word).
'up?' becomes 'addle' (I can't explain this - if you can you should believe this answer much more).
The first letter of 'wrap' is 'w'.
't'+'w'+'addle'='TWADDLE'
Can you help me to learn more?
(Other definitions for twaddle that I've seen before include "Poppycock" , "Balderdash" , "Bull" , "Stuff and nonsense" , "Pretentious or silly talk" .)