Returning home is largely painful for composer (7)
I believe the answer is:
rossini
'for composer' is the definition.
(Italian composer Gioachino Rossini)
'returning home is largely painful' is the wordplay.
'returning' shows that the letters should be reversed in order.
'home' becomes 'in' ('he's home' can mean 'he's in').
'largely' means to remove the last letter (most but not all of the letters).
'painful' becomes 'sore' (synonyms).
'sore' with its last letter taken away is 'sor'.
'in'+'is'+'sor'='inissor'
'inissor' reversed gives 'ROSSINI'.
(Other definitions for rossini that I've seen before include "he scored regularly" , "He composed operas" , "Composer of the opera William Tell, d. 1868" , "Composer born 29 Feb 1792" , "Barber of Seville writer" .)