What does the cryptic crossword clue "Irritated, avoided ignoring mum (5)" mean?

The definition is "Irritated,". The wordplay uses a deletion. IRKED (deletion) = IRKED; definition: "Irritated," The answer is IRKED.

Irritated, avoided ignoring mum (5)

Guardian Cryptic #29535 | 23 Down | 2024-11-08 flower