Magnificent golf managed by daughter (5)
I believe the answer is:
grand
'magnificent' is the definition.
(thesaurus)
'golf managed by daughter' is the wordplay.
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'managed' becomes 'ran' (I've seen this before).
'by' means one lot of letters go next to another.
'daughter' becomes 'd'.
'g'+'ran'+'d'='GRAND'
(Other definitions for grand that I've seen before include "1,000 GBP" , "Stately - splendid" , "sum of money" , "One thousand pounds" , "PS1000 (sl.)" .)