An aid returning from the Goddess of the Moon (5)
I believe the answer is:
diana
'the goddess of the moon' is the definition.
(I've seen this in another clue)
'an aid returning' is the wordplay.
'returning' is a reversal indicator.
'an'+'aid'='anaid'
'anaid' in reverse letter order is 'DIANA'.
'from' acts as a link.
(Other definitions for diana that I've seen before include "Girl's name; goddess" , "Girl" , "She separated from Charles" , "Roman goddess of the hunt, or tragic English princess" , "Roman goddess of the moon and the hunt" .)