Once again figures as a keepsake (5)
I believe the answer is:
relic
'a keepsake' is the definition.
(I know that keepsake can be written as relic)
'once again figures' is the wordplay.
'once again' becomes 're' (prefix in verbs).
'figures' becomes 'lic' (I can't justify this - if you can you should believe this answer much more).
're'+'lic'='RELIC'
'as' acts as a link.
Can you help me to learn more?
(Other definitions for relic that I've seen before include "Surviving artefact" , "Part of a holy person's body or possession" , "Fossil" , "Object surviving from the past" , "Bit of a saint, perhaps" .)