Creature of pride left one working (4)

I believe the answer is:

lion

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'creature of pride' is the definition.
'lion' can be an answer for 'creature' (I've seen this before). I am unsure of the 'of pride' bit.

'left one working' is the wordplay.
'left' becomes 'l' (common abbreviation).
'one' becomes 'i' (Roman numeral).
'working' becomes 'on' (on can mean working or activated).
'l'+'i'+'on'='LION'

Can you help me to learn more?

(Other definitions for lion that I've seen before include "Cat, the king of the beasts" , "Leo" , "Maned beast" , "Large cat; rugby player" , "bold type" .)

I've seen this clue in The Daily Express.

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