It grows wild, half frenzied! (4)
I believe the answer is:
fern
'it grows' is the definition.
The definition suggests a singular noun which matches the answer.
'wild half frenzied' is the wordplay.
'wild' indicates anagramming the letters.
'half' indicates taking half.
'frenzied' cut in half is 'fren'.
'fren' anagrammed gives 'FERN'.
Can you help me to learn more?
(Other definitions for fern that I've seen before include "Girl - bracken" , "Feathery-leaved plant" , "Plant reproducing by spores" , "Non-flowering plant" , "Flowerless plant with feathery fronds" .)