Clubs member to be upwardly mobile? (5)
I believe the answer is:
climb
'be upwardly mobile?' is the definition.
'clubs member' is the wordplay.
'clubs' becomes 'c' (abbreviation in card games).
'member' becomes 'limb' (member can mean a limb).
'c'+'limb'='CLIMB'
'to' acts as a link.
(Other definitions for climb that I've seen before include "Rise to a higher level" , "Scale or clamber" , "Get higher" , "Rise (in value, status)" , "Mount, ascend" .)