She can provide a form of aid (3)
I believe the answer is:
ida
'she' is the definition.
(I've seen this before)
'a form of aid' is the wordplay.
'a form of' is an anagram indicator (another form of the same letters).
'aid' with letters rearranged gives 'IDA'.
'can provide' acts as a link.
(Other definitions for ida that I've seen before include "Greek mount - Gilbertian princess" , "Princess in a Gilbert and Sullivan comic opera" , "princess on stage" , "lady" , "Girl's name; aid (anag.)" .)