Love extracting energy from river (3)

I believe the answer is:

nil

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

I don't understand the remainder of the clue.

(Other definitions for nil that I've seen before include "Nothing, zero" , "Score of nought" , "Nothing - in Latin" , "Nothing, naught" , "You get nothing" .)

I've seen this clue in The Times.

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