What does the cryptic crossword clue "Contract upset Martin Kemp to some extent (4)" mean?

The definition is "Contract". The wordplay uses a hidden word. Hidden reversed in "contract upset marTIN Kemp to some extent" The answer is KNIT.

Contract upset Martin Kemp to some extent (4)

Guardian Cryptic #29630 | 1 Down | 2025-02-28 flower