Reform to relieve growth (5,4)

I believe the answer is:

olive tree

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'growth' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'reform to relieve' is the wordplay.
'reform' indicates an anagram (letters in a new form).
'to'+'relieve'='torelieve'
'torelieve' with letters rearranged gives 'OLIVE TREE'.

Can you help me to learn more?

(Other definitions for olive tree that I've seen before include "oil supplier" , "bearer of fruit" .)

I've seen this clue in The Daily Express.

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