Crossword Genius

Unconvincing criticism after book put out (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 "Flimsy, as an excuse" , "Unable to walk properly" , "Thin plate" , "Having impaired walking ability" , "(Of an excuse) unconvincingly feeble" .)

I've seen this clue in The Independent.
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