Crossword Genius

It takes days to build a side (4)

Ross

I believe the answer is:

ides

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'it takes days' is the definition.
The definition suggests a singular noun which matches the answer.

'build a side' is the wordplay.
'build' indicates anagramming the letters.
'side' is an anagram of 'IDES'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for ides that I've seen before include "ill-fated time" , "Julius Caesar was told to beware the . . . . of March" , "mid-month for the Romans" , "13th or 15th day of the month in Roman calendar" , "Orfes" .)

I've seen this clue in the Evening Standard.
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