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Set up No.1 club like Simba, for example, at a young age (4,3)

Ross

I believe the answer is:

lion cub

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

'set up no' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'1 club like simba for example at a young age' is the wordplay.
I cannot quite see how this works, but
'1' could be 'i' (roman numeral) and 'i' is found within the answer.
'at' could be 'on' (location) and 'on' is found in the answer.
an anagram of 'club' is 'lcub' which is present in the remaining letters.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

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

I've seen this clue in The Hindu.
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