Relative Fauntleroy entertains (4)
I believe the answer is:
aunt
'relative' is the definition.
(aunt is a kind of relative)
'fauntleroy entertains' is the wordplay.
'entertains' indicates the answer is hidden within the clue (the answer is welcomed or entertained by the clue).
'AUNT' can be found hidden inside 'fauntleroy'.
(Other definitions for aunt that I've seen before include "Charley's ___ , farce staged in London in 1892, revived and adapted ever since" , "Family relative" , "Uncle's wife" , "Parent's female sibling" , "Charley's in play?" .)