Avoids committing oneself to growing boundaries (6)
I believe the answer is:
hedges
'avoids' is the definition.
(hedging is a kind of avoiding)
'committing oneself to growing boundaries' is the wordplay.
I cannot really understand how this works, but
'boundaries' could be 'edges' ('edge' can be a synonym of 'boundary') and 'edges' is present in the answer.
A single letter 'h' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for hedges that I've seen before include "Shields" , "Fences made for business" , "Fences of bushes" , "Boundaries of shrubs planted close together" , "guards" .)