True love OK? (8,4)

I believe the answer is:

absolute zero

'ok?' is the definition.
(resembles 0K, the temperature 0 Kelvin)

'true love' is the wordplay.
'true' becomes 'absolute'.
'love' becomes 'zero' (I've seen this before).
'absolute'+'zero'='ABSOLUTE ZERO'

(Other definitions for absolute zero that I've seen before include "Coldest temperature" , "Minus 273 1/4 C approx." , "Lowest theoretical temperature" , "OK?" , "Lowest temperature theoretically possible" .)

I've seen this clue in The Times.

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