Her post is an arranged state post (11)

I believe the answer is:

senatorship

I'm a little stuck... Click here to teach me more about this clue!

'state post' is the definition.
'senatorship' can be an answer for 'post' (senatorship is a kind of post). I am not sure about the 'state' bit.

'her post is an arranged' is the wordplay.
'arranged' is an anagram indicator (letters rearranged).
'her'+'post'+'is'+'an'='herpostisan'
'herpostisan' with letters rearranged gives 'SENATORSHIP'.

Can you help me to learn more?

(Another definition for senatorship that I've seen is " political office".)

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