Throw away support (5)
I believe the answer is:
sling
This clue could be a double definition.
'throw away' is the first definition.
'sling' can be an answer for 'throw' (chuck means throw as does sling). I'm unsure of the 'away' bit.
'support' is the second definition.
(sling is a type of support for member (ie an arm))
Can you help me to learn more?
(Other definitions for sling that I've seen before include "American drink" , "Catapult - shoe - support" , "Arm bandage; hurl" , "Stone-throwing weapon" , "Cloth to support arm" .)