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One month Inspector-General, rear admiral and madame gained a bit of weight (10)

Ross

I believe the answer is:

decigramme

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'gained a bit of weight' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'one month inspector-general rear admiral and madame' is the wordplay.
'one month' becomes 'dec' (abbreviation for December).
'inspector general' becomes 'ig' (this could be a standard abbreviation of which I'm unaware).
'rear admiral' becomes 'RA' (naval abbreviation).
'and' is a charade indicator (letters next to each other).
'madame' becomes 'mme' (abbreviation).
'dec'+'ig'+'ra'+'mme'='DECIGRAMME'

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