Grateful old boy told stories about golf (7)
I believe the answer is:
obliged
'grateful' is the definition.
(thesaurus)
'old boy told stories about golf' is the wordplay.
'old boy' becomes 'ob'.
'told stories' becomes 'lied' (I've seen this in other clues).
'about' indicates putting letters inside.
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'lied' going around 'g' is 'liged'.
'ob'+'liged'='OBLIGED'
(Other definitions for obliged that I've seen before include "Morally or legally bound (to do something)" , "Indebted" , "Grateful - compelled" , "Bound by duty or gratitude" , "Duty-bound" .)