Crossword Genius

Less than four? Education is primary (9)

Ross

I believe the answer is:

underived

'primary' is the definition.
(similar in meaning)

'less than four? education' is the wordplay.
'less than' becomes 'under' (eg under a certain number).
'four?' becomes 'iv' (Roman numerals for four).
'education' becomes 'ed' (abbreviation - e.g. sex ed).
'under'+'iv'+'ed'='UNDERIVED'

'is' acts as a link.

I've seen this clue in The Guardian.
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