Go along with a conservationist, except for his conclusion (5)

I believe the answer is:

agree

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'go along' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for agree that I've seen before include "Eager (anag)" , "Allow" , "Say yes to a suggestion" , "'Birds in their little nest . . . . .'" , "Go along with" .)

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

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