Set line to be adopted by home help (6)
I believe the answer is:
inlaid
'set' is the definition.
(I've seen this in another clue)
'line to be adopted by home help' is the wordplay.
'line' becomes 'l' (used when specifying particular lines from a poem).
'to be adopted by' indicates putting letters inside (I've seen this in other clues).
'home' becomes 'in' ('he's home' can mean 'he's in').
'help' becomes 'aid' (synonyms).
'in'+'aid'='inaid'
'l' inserted within 'inaid' is 'INLAID'.
(Other definitions for inlaid that I've seen before include "(Of decorative items) embedded" , "Studded" , "Adorned with inserted wood etc" , "Having another material set into it" , "kind of decorative work" .)