More and more entered for race, processed one by one (12)
I believe the answer is:
increasingly
'more and more' is the definition.
(synonyms)
'entered for race processed one by one' is the wordplay.
'entered for' becomes 'in' (I can't justify this - if you can you should believe this answer much more).
'processed' indicates an anagram.
'one by one' becomes 'singly' (synonyms).
'race' is an anagram of 'crea'.
'in'+'crea'+'singly'='INCREASINGLY'
Can you help me to learn more?
(Another definition for increasingly that I've seen is " More and more".)