Crossword Genius

It can swell a father's pride (3)

Ross

I believe the answer is:

cub

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

This clue might be a double definition.

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

'swell a father's pride' is the second definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?

'can' acts as a link.

Can you help me to learn more?

(Other definitions for cub that I've seen before include "Young lion or fox" , "Inexperienced reporter" , "Young bear or lion" , "Whelp" , "Baby animal, bear say" .)

I've seen this clue in The Globe and Mail.
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