Fit for inclusion in tableaux (4)

I believe the answer is:

able

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'fit for inclusion' is the definition.
'able' can be an answer for 'fit' (I've seen this before). I am not sure about the 'for inclusion' bit.

'in tableaux' is the wordplay.
'in' says the answer is hidden in the clue.
'ABLE' is hidden within 'tableaux'.

Can you help me to learn more?

(Other definitions for able that I've seen before include "Competent, having ability" , "Bale out, being competent" , "Bright" , "Of high proficiency" , "Clever skilful" .)

I've seen this clue in the Evening Standard.

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