Worked out only daughter’s about five (6)
I believe the answer is:
solved
'worked out' is the definition.
(I've seen this before)
'only daughter's about five' is the wordplay.
'only' becomes 'sole' (synonyms).
'daughter' becomes 'd' (genealogical abbreviation).
'about' means one lot of letters goes inside another.
'five' becomes 'V' (Roman numeral).
'sole'+'d'='soled'
'soled' going around 'v' is 'SOLVED'.
(Other definitions for solved that I've seen before include "Found the answer, to problem or puzzle" , "Discovered the answer to a puzzle" , "Explained or answered a mystery" , "Cracked" , "Explained or answered, puzzle say" .)