Left bar, ignoring last of indecent language (5)

I believe the answer is:

lingo

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'indecent language' is the definition.
'lingo' can be an answer for 'language' (informal term for language). I'm not sure about the 'indecent' bit.

'left bar ignoring last' is the wordplay.
'left' becomes 'L' (common abbreviation).
'bar' becomes 'ingot' (block of metal, eg a bar of gold).
'ignoring last' means to remove the last letter.
'ingot' with its last letter removed is 'ingo'.
'l'+'ingo'='LINGO'

'of' is the link.

Can you help me to learn more?

(Other definitions for lingo that I've seen before include "Vernacular" , "Jargon, foreign language (informal)" , "Argot" , "strange language" , "Jargon, language (colloq.)" .)

I've seen this clue in The Times.

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