Capital! His leader leaves the chair and gets nothing (5)
I believe the answer is:
cairo
'capital' is the definition.
(Cairo is an example)
'leader leaves the chair and gets nothing' is the wordplay.
'leader' becomes 'PM' (PM is an example).
'leaves' suggests deleting specific letters.
'the chair' becomes 'camp' (camp chair is a kind of chair).
'and' is a charade indicator (letters next to each other).
'gets nothing' becomes 'iro' (I can't explain this - if you can you should believe this answer much more).
'camp' with 'pm' taken away is 'ca'.
'ca'+'iro'='CAIRO'
'his' is the link.
This may not be right. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for cairo that I've seen before include "African city" , "Port upstream from the Nile delta" , "Al Qahira" , "City near the Nile delta" , "Capital city on the Nile" .)