Spar put in advertisement for email manager (10)

I believe the answer is:

postmaster

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'email manager' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'spar put in advertisement' is the wordplay.
'spar' becomes 'mast' (mast is a kind of spar).
'put in' means one lot of letters goes inside another.
'advertisement' becomes 'poster' (poster is a kind of advertisement).
'mast' inserted into 'poster' is 'POSTMASTER'.

'for' is the link.

Can you help me to learn more?

(Other definitions for postmaster that I've seen before include "who runs a local office?" , "Mail chief" .)

I've seen this clue in The Times.

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