Crossword Genius

Uncompromising approach in Enduring Love? (4,9)

Ross

I believe the answer is:

zero tolerance

I'm a little stuck... Click here to teach me more about this clue!

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

'enduring love?' is the wordplay.
I cannot quite see how this works, but
'love?' could be 'zero' (love is zero in tennis) and 'zero' is located in the answer.
The remaining letters 'tolerance' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'in' is the link.

Can you help me to learn more?

(Other definitions for zero tolerance that I've seen before include "Total crackdown on specific social problem" , "Uncompromising application of the law against antisocial behaviour" , "A policy towards antisocial behaviour" , "Strict treatment" , "not putting up with anything wicked?" .)

I've seen this clue in The Times.
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