Crazy set of directions were rational (4,5)

I believe the answer is:

made sense

'were rational' is the definition.
(to make sense is to be rational or logical)

'crazy set of directions' is the wordplay.
'crazy' becomes 'mad' (synonyms).
'set of directions' becomes 'ESENSE' (six compass points).
'mad'+'esense'='MADE SENSE'

(Another definition for made sense that I've seen is " sounded OK".)

I've seen this clue in The Guardian.

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