Special wound dressing gives support (6)
I believe the answer is:
splint
'support' is the definition.
(I've seen this before)
'special wound dressing' is the wordplay.
'special' becomes 'sp' (abbreviation).
'wound dressing' becomes 'lint' (I've seen this before).
'sp'+'lint'='SPLINT'
'gives' is the link.
(Other definitions for splint that I've seen before include "Aid to bone-setting" , "Brace for broken limb" , "Rigid device supporting a fractured bone" , "'It's used to immobilise a broken leg, say (6)'" , "Support for injured arm" .)