Flare in wild fashion (5)

I believe the answer is:

feral

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'flare in wild' is the definition.
'feral' can be an answer for 'wild' (I've seen this in another clue). I am not certain of the 'flare in' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for feral that I've seen before include "Fierce, having reverted to wild state" , "Flare up in wild state" , "Wild but originally domestic" , "Flare up, being fierce" , "Wild, untamed" .)

I've seen this clue in the Evening Standard.

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