What does the cryptic crossword clue "A mature MP I suspect in high demand (2,1,7)" mean?

The wordplay uses an anagram. anagram of A + MATURE + MP + I = ATAPREMIUM The answer is ATAPREMIUM.

A mature MP I suspect in high demand (2,1,7)

Daily Mail Cryptic #17052 | 25 Across | 2023-03-13 flower