Crossword Genius

Pride issue about copper in library (4,3)

Ross

I believe the answer is:

lion cub

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'pride' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'about copper in library' is the wordplay.
'about' becomes 'on' (as in a book 'on' a certain topic).
'copper' becomes 'Cu' (chemical symbol).
'in' means one lot of letters goes inside another.
'library' becomes 'lib' (short for library).
'on'+'cu'='oncu'
'oncu' inserted within 'lib' is 'LION-CUB'.

'issue' is the link.

Can you help me to learn more?

(Other definitions for lion cub that I've seen before include "Baby feline" , "Young mauler" , "beastly prince?" , "Elsa's offspring possibly (Born Free)" , "Young pride member" .)

I've seen this clue in The Times.
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