Ol' Bert's out to get ol' Tommy! (7)

I believe the answer is:

lobster

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'get ol' tommy' is the definition.
I can't tell whether this definition defines the answer.

'ol' bert's out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'ol'+'berts'='olberts'
'olberts' is an anagram of 'LOBSTER'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for lobster that I've seen before include "One showing claws" , "Large edible crustacean" , "could find this on the table" , "Large marine crustacean" , "Marine creature" .)

I've seen this clue in The Times.

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