It was good to settle for a midday meal (8,7)

I believe the answer is:

luncheon voucher

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'it was good' is the definition.
The definition suggests a singular noun which matches the answer.

'settle for a midday meal' is the wordplay.
'settle' becomes 'voucher' (I can't explain this - if you can you should believe this answer much more).
'for' says to put letters next to each other (I've seen this in other clues).
'a midday meal' becomes 'luncheon' (I've seen this before).
'voucher' put after 'luncheon' is 'LUNCHEON VOUCHER'.

'to' is the link.

Can you help me to learn more?

I've seen this clue in The Times.

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