Crossword Genius

Confused a year with shorter period (3)

Ross

I believe the answer is:

day

I'm a little stuck... Click here to teach me more about this clue!

'shorter period' is the definition.
'day' can be an answer for 'period' (day is a kind of period). I'm unsure of the 'shorter' bit.

'confused a year with' is the wordplay.
'with' indicates a hidden word.
'DAY' is hidden in the letters of 'confused a year'.

Can you help me to learn more?

(Other definitions for day that I've seen before include "24 23 acrosses" , "Dawn to dusk" , "Particular date" , "Doris -, US actress" , "24-hour period" .)

I've seen this clue in The Mirror.
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