Cat’s finally falling in step (5)

I believe the answer is:

tiger

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'cat's' is the definition.
(tiger is a kind of cat)

'finally falling in step' is the wordplay.
'finally' says to take the final letters.
'in' is an insertion indicator.
'step' becomes 'tier' (I can't justify this - if you can you should believe this answer much more).
The last letter of 'falling' is 'g'.
'g' going within 'tier' is 'TIGER'.

Can you help me to learn more?

(Other definitions for tiger that I've seen before include "Ferocious person" , "Beast - type of 1 across" , "Large wild cat" , "One noted for stripes" , "Endangered carnivore" .)

I've seen this clue in The Hindu.

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