They're not there to have toast (6,7)

I believe the answer is:

absent friends

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'they're' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'not there to have toast' is the wordplay.
'not there' becomes 'absent' (I've seen this in another clue).
'to have toast' becomes 'friends' (I can't explain this - if you can you should give a lot more credence to this answer).
'absent'+'friends'='ABSENT-FRIENDS'

Can you help me to learn more?

(Another definition for absent friends that I've seen is " Those honoured in a toast".)

I've seen this clue in The Daily Express.

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