First of musicians arrives with one before time of wedding (8)
I believe the answer is:
marriage
'wedding' is the definition.
(synonyms)
'first of musicians arrives with one before time' is the wordplay.
'first of musicians' becomes 'm' (ast letter of 'musicians').
'arrives' becomes 'arr' (abbreviation used in transport).
'with' says to put letters next to each other.
'one' becomes 'i' (Roman numeral).
'before time' becomes 'age' (an age is a period of time. I am not sure about the 'before' bit.).
'm'+'arr'+'i'+'age'='MARRIAGE'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for marriage that I've seen before include ""Till death do us part" arrangement" , "Wedding" , "Church occasion" , "Wedlock of alliance" , "nuptials" .)