Crossword Genius

Like a lamb later in life? (8)

Ross

I believe the answer is:

sheepish

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'like' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

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(Other definitions for sheepish that I've seen before include "Shyly embarrassed" , "Embarrassed in woolly way?" , "Embarrassed -- like ewe!" , "Embarrassedly shy" , "Embarrassed, looking silly" .)

I've seen this clue in The Irish News.
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