Fit desk after removing top (4)

I believe the answer is:

able

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'fit' is the definition.
(similar in meaning)

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

(Other definitions for able that I've seen before include "Having the skills and qualifications required" , "Capable seaman" , "- -bodied; - seaman" , "Having the necessary capacity (to do something)" , "Having the ability to do something" .)

I've seen this clue in the Sydney Morning Herald.

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