Terrible fear closed business that underwent this? (6,4)

I believe the answer is:

forced sale

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

'business that underwent this?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'terrible fear closed' is the wordplay.
'terrible' indicates anagramming the letters.
'fear'+'closed'='fearclosed'
'fearclosed' with letters rearranged gives 'FORCED SALE'.

Can you help me to learn more?

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.