Eric runs out of money for a keepsake (5)
I believe the answer is:
relic
'for a keepsake' is the definition.
(synonyms)
'eric runs out of money' is the wordplay.
'runs' is an anagram indicator.
'out of' indicates putting letters inside (some letters on the outside of others).
'money' becomes 'l' (L can mean 'pounds').
'eric' anagrammed gives 'reic'.
'reic' enclosing 'l' is 'RELIC'.
(Other definitions for relic that I've seen before include "Part of a holy person's body or possession" , "bit of old religious tradition" , "Left over item, sometimes sacred" , "Memorial of antiquity" , "Holy remnant" .)