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Wherein tip-up seats could be appropriate (3)

Ross

I believe the answer is:

pit

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

'appropriate' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how they can define each other.

'wherein tip-up seats could' is the wordplay.
'tip' anagrams to 'PIT'.
Though, I'm not sure how this is indicated.

'be' acts as a link.

Can you help me to learn more?

(Other definitions for pit that I've seen before include "Sizeable hole in the ground" , "Large deep hole in the ground" , "Where the orchestra sits at an opera" , "Hellhole?" , "Portland stone" .)

I've seen this clue in the Evening Standard.
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