Going up, like foreign money (6)
I believe the answer is:
ascent
'going up' is the definition.
(ascending means going up)
'like foreign money' is the wordplay.
'like' becomes 'as'.
'foreign money' becomes 'cent' (denomination of foreign currencies eg the euro).
'as'+'cent'='ASCENT'
(Other definitions for ascent that I've seen before include "Acclivity" , "Incline" , "Upward slope" , "Act of moving upwards" , "rising?" .)