Member following Celsius scale (5)
I believe the answer is:
climb
'scale' is the definition.
(thesaurus)
'member following celsius' is the wordplay.
'member' becomes 'limb' (limb is a kind of member**).
'following' says to put letters next to each other.
'celsius' becomes 'c' ('c' can be a synonym of 'celsius').
'limb' put after 'c' is 'CLIMB'.
(Other definitions for climb that I've seen before include "Move upwards, ascend" , "Deadened" , "Ascend, escalate" , "Go up - scale" , "Get a rise" .)