She's a help having turned up (5)
I believe the answer is:
diana
'she's' is the definition.
'a help having turned up' is the wordplay.
'a' becomes 'an'.
'help' becomes 'aid' (synonyms).
'having turned up' is a reversal indicator.
'an'+'aid'='anaid'
'anaid' written backwards gives 'DIANA'.
(Other definitions for diana that I've seen before include "Roman goodess of hunting or tragic English princess" , "female" , "Girl" , "She separated from Charles" , ""The People's Princess"" .)