Crossword Genius

Unavoidable day matron goes mad (9)

Ross

I believe the answer is:

mandatory

'unavoidable' is the definition.

'day matron goes mad' is the wordplay.
'goes mad' indicates an anagram.
'day'+'matron'='daymatron'
'daymatron' anagrammed gives 'MANDATORY'.

(Other definitions for mandatory that I've seen before include "Not optional" , "Binding" , "required" , "allowing no option" , "Obligatory" .)

I've seen this clue in The Times.
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