Father, for example, holding post back in assembly (10)
I believe the answer is:
parliament
'assembly' is the definition.
(parliament is a kind of assembly)
'father for example holding post back' is the wordplay.
'father for example' becomes 'parent' (father is a kind of parent).
'holding' means one lot of letters goes inside another.
'post back' becomes 'liam' (I can't justify this - if you can you should give a lot more credence to this answer).
'parent' going around 'liam' is 'PARLIAMENT'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for parliament that I've seen before include "Legislative assembly" , "Legislative body" , "The law is laid down here" , "Houses" , "Diet" .)