What does the cryptic crossword clue "Key argument in computer encryption process (6)" mean?

The definition is "Key". The wordplay uses a charade (building blocks). ESC (synonym="key") + ROW (synonym="argument") = ESCROW The answer is ESCROW.

Key argument in computer encryption process (6)

Guardian Cryptic #29600 | 26 Across | 2025-01-24 flower