Check the never-ending rough growth (6)
I believe the answer is:
thwart
'check' is the definition.
(to check is to frustrate or spoil a plan)
'the never-ending rough growth' is the wordplay.
'never ending' means to remove the last letter.
'rough growth' becomes 'wart' (I've seen this before. I am not sure about the 'rough' bit.).
'the' with its final letter taken away is 'th'.
'th'+'wart'='THWART'
Can you help me to learn more?
(Other definitions for thwart that I've seen before include "Frustrate and obstruct" , "seat for oarsman" , "Hinder or prevent" , "Oppose successfully" , "Stymie" .)