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Men upset about the Spanish book on our former PM (9)

Ross

I believe the answer is:

melbourne

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

'former pm' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'men upset about the spanish book on our' is the wordplay.
'upset' is an anagram indicator.
'about' is an insertion indicator.
'the spanish' becomes 'el' (**).
'book' becomes 'b'.
'on' indicates putting letters inside (as in clothing \'on\' a person).
'men' anagrammed gives 'mne'.
'el'+'b'='elb'
'mne' placed around 'elb' is 'melbne'.
'melbne' placed around 'our' is 'MELBOURNE'.

Can you help me to learn more?

(Other definitions for melbourne that I've seen before include "First capital of Australia (1901-27)" , "Prime minister to William IV - setting for many an 6 test" , "Australian city" , "State capital of Victoria" , "home for Victorians" .)

I've seen this clue in The Telegraph.
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