Apply for the job of president? (5)
I believe the answer is:
putin
'president?' is the definition.
(Russian president Vladimir Putin)
'apply for the job' is the wordplay.
'apply' becomes 'put' (putting is a kind of applying).
'for' means one lot of letters go next to another.
'the job' becomes 'in' (I can't justify this - if you can you should give a lot more credence to this answer).
'put'+'in'='PUTIN'
'of' is the link.
Can you help me to learn more?
(Other definitions for putin that I've seen before include "Russian leader" , "powerful leader" , "Russian president" , "Introduce" .)