What does the cryptic crossword clue "Agitated vain mum cut no ice, not saying much (15)" mean?

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

Agitated vain mum cut no ice, not saying much (15)

Daily Mail Cryptic #16426 | 2 Down | 2020-10-16 flower