Try to appropriate all the biggest (7)
I believe the answer is:
tallest
'biggest' is the definition.
Both the definition and answer are superlative adjectives. Perhaps there's an association between them I don't understand?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for tallest that I've seen before include "most unlikely" , "Highest in stature" , "Sell tat (anag.)" , "Of greatest vertical extent" , "Of greatest height" .)