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Leaves and makes excuses initially unconvincing (4)

Ross

I believe the answer is:

lame

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'unconvincing' is the definition.
(I've seen this in other clues)

I cannot understand how the rest of the clue works.

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(Other definitions for lame that I've seen before include "Weak kind of excuse for halting walk" , "Imperfect - material" , "Crippled" , "Feeble; cripple" , "Having impaired walking ability" .)

I've seen this clue in The Sun and The Times.
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