What does the cryptic crossword clue "Terrible Ivan cut no ice with Mum, being tight-lipped (15)" mean?

The wordplay uses an anagram. anagram of IVAN + CUT + NO + ICE + MUM, = UNCOMMUNICATIVE The answer is UNCOMMUNICATIVE.

Terrible Ivan cut no ice with Mum, being tight-lipped (15)

Daily Mail Cryptic #16710 | 1 Down | 2021-11-18 flower