They are not being true lovers (9)

I believe the answer is:

romancers

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

'they are not' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'being true lovers' is the wordplay.
I cannot really see how this works, but
'being' could be 'man' (man is a kind of being) and 'man' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Guardian.

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