Crossword Genius

A growing cause for one to call out wildly? (5)

Ross

I believe the answer is:

lilac

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

'a growing cause' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'one to call out wildly?' is the wordplay.
'one to' becomes 'li' (I can't explain this - if you can you should believe this answer much more).
'out' means to remove the last letter.
'wildly?' indicates an anagram (I've seen 'wildly' mean this).
'call' with its final letter removed is 'cal'.
'cal' is an anagram of 'lac'.
'li'+'lac'='LILAC'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for lilac that I've seen before include "Pale purple - flowering tree" , "Plant" , "Spiritual knowledge" , "Light purple - shrub" , "Fragrant,purple flower" .)

I've seen this clue in the Evening Standard.
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