Crossword Genius

Fully able to slot in nicely (3)

Ross

I believe the answer is:

fit

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'fully able' is the definition.
'fit' can be an answer for 'able' (similar in meaning). I am not sure about the 'fully' bit.

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

Can you help me to learn more?

(Other definitions for fit that I've seen before include "Suit" , "Be the right size or shape" , "In trim" , "Physically well" , "Sound in body or suitable" .)

I've seen this clue in the Evening Standard.
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