Be quiet on condition that tyrannical leader will change position (5)
I believe the answer is:
shift
'change position' is the definition.
(shifting is a kind of changing position)
'be quiet on condition that tyrannical leader' is the wordplay.
'be quiet' becomes 'sh' (both are said to tell someone to stop speaking).
'on' says to put letters next to each other.
'condition' becomes 'if' (as in 'a big if').
'that tyrannical leader' becomes 't' (I can't justify this - if you can you should give a lot more credence to this answer).
'sh'+'if'+'t'='SHIFT'
'will' is the link.
Can you help me to learn more?
(Other definitions for shift that I've seen before include "Dislodge" , "Simple dress; spell of work" , "Switch" , "Change location" , "Change - period of work" .)