Gain altitude using carbon wing, perhaps (5)
I believe the answer is:
climb
'gain altitude' is the definition.
(thesaurus)
'carbon wing perhaps' is the wordplay.
'carbon' becomes 'c' (C is the chemical symbol for carbon).
'wing perhaps' becomes 'limb' (wing is a kind of limb).
'c'+'limb'='CLIMB'
'using' acts as a link.
(Other definitions for climb that I've seen before include "Go upwards" , "Move upwards, ascend" , "Go up - scale" , "Soar" , "Get higher" .)