Be inclined to need support (4)
I believe the answer is:
lean
'be inclined' is the definition.
(synonyms)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for lean that I've seen before include "Slope; thin" , "Insufficient - incline" , "Tend towards being thin" , "Slender" , "Incline to prop against" .)