The man on craft considered sincere (9)
I believe the answer is:
heartfelt
'sincere' is the definition.
(similar in meaning)
'the man on craft considered' is the wordplay.
'the man' becomes 'he' (pronoun for a man).
'on' means one lot of letters go next to another.
'craft' becomes 'art' (both can mean cunning or trickery).
'considered' becomes 'felt' (feel can mean to consider or think).
'he'+'art'+'felt'='HEARTFELT'
(Other definitions for heartfelt that I've seen before include "Let father have deep and earnest kind of emotion (9)" , "Sincerely intended with strong feeling" , "Deeply sincere" , "With sincere passion" , "Most fervent in cardiac way" .)