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Five years of lewdness and liquor (7)

Ross

I believe the answer is:

lustrum

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'five years' is the definition.
(I've seen this before)

'lewdness and liquor' is the wordplay.
'lewdness' becomes 'lust' (I can't explain this - if you can you should give a lot more credence to this answer).
'and' is a charade indicator (letters next to each other).
'liquor' becomes 'rum' (rum is a kind of liquor).
'lust'+'rum'='LUSTRUM'

'of' is the link.

Can you help me to learn more?

(Other definitions for lustrum that I've seen before include "several years" , "Five-year period" , "Period of five years" , "Period of 20 ac years" .)

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