Crossword Genius

Consider an unconvincing ending for a book (5)

Ross

I believe the answer is:

think

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'consider' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for think that I've seen before include "Cogitate; deem" , "Believe" , "Imagine" , "Use one's mind" , "Ponder" .)

I've seen this clue in the Evening Standard.
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