Crossword Genius

Knock dinner up to try to prevent collapse (8)

Ross

I believe the answer is:

underpin

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'try to prevent collapse' is the definition.
I can't judge whether this definition defines the answer.

'knock dinner up' is the wordplay.
'knock' indicates anagramming the letters.
'dinner'+'up'='dinnerup'
'dinnerup' is an anagram of 'UNDERPIN'.

'to' is the link.

Can you help me to learn more?

(Other definitions for underpin that I've seen before include "Support or strengthen from beneath" , "buttress" , "Prop up with nun pride" , "corroborate" , "Form the basis for" .)

I've seen this clue in The Telegraph.
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