Crossword Genius

Appear like Lent with a sad tear? (9)

Ross

I believe the answer is:

alternate

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

'appear' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Maybe there's a link between them I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for alternate that I've seen before include "go back and forth" , "Flip" , "Happen in turns, rotate" , "Go in turns" , "Happening or following in turns, one after the other" .)

I've seen this clue in The Times.
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