They may help to recall mobile Maria wrecked (11)
I believe the answer is:
memorabilia
'they may help to recall' is the definition.
(items which may recall memories)
'mobile maria wrecked' is the wordplay.
'wrecked' is an anagram indicator.
'mobile'+'maria'='mobilemaria'
'mobilemaria' with letters rearranged gives 'MEMORABILIA'.
(Other definitions for memorabilia that I've seen before include "Noteworthy points; collectables" , "evocative stuff!" , "Objects connected with famous people" , "Objects associated with the famous" , "Special souvenirs" .)