Post mine back in clerical payment (7)

I believe the answer is:

stipend

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'clerical payment' is the definition.
'stipend' can be an answer for 'payment' (stipend is a kind of payment). I'm not certain of the 'clerical' bit.

'post mine back in' is the wordplay.
'post' becomes 'send' (synonyms).
'mine' becomes 'pit' (down the pit).
'back' shows that the letters should be reversed in order.
'in' is an insertion indicator.
'pit' in reverse letter order is 'tip'.
'send' placed around 'tip' is 'STIPEND'.

Can you help me to learn more?

(Other definitions for stipend that I've seen before include "Parson's pay" , "minister's wages" , "Minister's salary" , "Regular payment" , "Wage" .)

I've seen this clue in the Sydney Morning Herald.

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