Labour's aim always stated (9)

I believe the answer is:

endeavour

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'labour's aim' is the definition.
'endeavour' can be an answer for 'aim' (I've seen this before). I am not certain of the 'labour's' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for endeavour that I've seen before include "Try - Cook's ship" , "famous ship" , "Strive - Inspector Morse's first name" , "Strive - over a nude (anag)" , "Morse" .)

I've seen this clue in The Times.

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