The most common and most likely answer to this crossword clue is the 7 letter word ASEXUAL
I've seen this crossword clue in The Times
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More clues leading to the result ASEXUAL
- Chance losing face when hugging old flame devoid of passion
- When former lover starts to undress, ageing libertine lacking the urge
- Platonic kiss beau’s ending in a clinch
- In customary manner, old flame displaces you and me with no hanky-panky
- Saxe blue turned gold on line that describes cloning
- Like former wife, coupled topless without libido
- No interest in it when uniform’s worn by former sweetheart Gail from time to time
Buddy explains!

The straight part
We know that "devoid of passion" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case devoid of passion = asexual.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does ASEXUAL mean?
ASEXUAL noun- A species which reproduces by asexual rather than sexual reproduction, or a member of such a species.
- A person who does not experience sexual attraction; a person who lacks interest in or desire for sex.
- Something which does not have a sex, or a word which refers to such a thing.
- Nonsexual in nature, unmarked by sexual activity. (Compare Platonic.)
- Not experiencing sexual attraction; lacking interest in or desire for sex.
- Lacking distinct sex, lacking sexual organs.
- Without sexual action; reproducing by some other method than sex.