Last king we put up expanded (4)

I believe the answer is:

grew

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'expanded' is the definition.
(I've seen this in another clue)

'last king we put up' is the wordplay.
'last king' becomes 'gr' (short for Georgius Rex, King George in Latin. I am not sure about the 'last' bit.).
'put up' is a reversal indicator.
'we' back-to-front is 'ew'.
'gr'+'ew'='GREW'

Can you help me to learn more?

(Other definitions for grew that I've seen before include "Increased in size" , "Sprouted" , "Multiplied" , "Developed, matured" , "Rose" .)

I've seen this clue in The Mirror.

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