Old guy provided backing for servant getting married (6)
I believe the answer is:
figaro
'servant getting married' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'old guy provided backing' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'guy' becomes 'rag' (both can mean to tease or mock).
'provided' becomes 'if' (eg 'provided it's sunny' means 'if it's sunny').
'backing' says the letters should be written backwards.
'o'+'rag'+'if'='oragif'
'oragif' reversed gives 'FIGARO'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for figaro that I've seen before include "Beaumarchais hero" , "The Barber of Seville" , "devoured in Paris" , "Rossini's barber; Mozart's major-domo" , "Operatic bridegroom" .)