One about five find the answer (5)
I believe the answer is:
solve
'find the answer' is the definition.
(I've seen this in another clue)
'one about five' is the wordplay.
'one' becomes 'sole' (synonyms).
'about' means one lot of letters goes inside another.
'five' becomes 'V' (Roman numeral).
'sole' going around 'v' is 'SOLVE'.
(Other definitions for solve that I've seen before include "Find the solution to puzzle or problem" , "Work out answer to puzzle" , "Decipher" , "Deal with (a problem)" , "Find the answer or explanation" .)