Turned on elements of company: "I'm unable to help” (2,3,2)

I believe the answer is:

no can do

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'unable to help' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for no can do that I've seen before include "Bring-a-bottle party?" , "That's out of the question!" , "Impossible, I'm afraid!" , "That's not possible" , "off-putting response" .)

I've seen this clue in The Independent.

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