She needs aid terribly! (3)
I believe the answer is:
ida
'she' is the definition.
(I've seen this before)
'aid terribly' is the wordplay.
'terribly' indicates anagramming the letters.
'aid' with letters rearranged gives 'IDA'.
'needs' is the link.
(Other definitions for ida that I've seen before include "Princess in a Gilbert and Sullivan comic opera" , "Princess __ (G&S comic opera)" , "Trojan Mount; G&S Princess" , "Stagey princess" , "The girl for Dai" .)