Gold in climber is creamy white (5)
I believe the answer is:
ivory
'creamy white' is the definition.
(I've seen this in another clue)
'gold in climber' is the wordplay.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'in' indicates putting letters inside.
'climber' becomes 'ivy' (ivy is a climbing plant).
'or' inserted into 'ivy' is 'IVORY'.
'is' is the link.
(Other definitions for ivory that I've seen before include "What tusks are made of" , "Like the tower" , "Key material" , "Piano-key" , "Hard creamy-white dentine used for making ornaments" .)