Some slob mashed up local's BLT? (5)

I believe the answer is:

sambo

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'local's blt?' is the definition.
The definition suggests a singular noun which matches the answer.

'some slob mashed up' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'obmas' is hidden within 'slob mashed'.
'obmas' reversed gives 'SAMBO'.

Can you help me to learn more?

(Another definition for sambo that I've seen is " Wrestling".)

I've seen this clue in The Irish Times.

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