Aid sent out as alternative (7)
I believe the answer is:
instead
'as alternative' is the definition.
(I've seen this before)
'aid sent out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'aid'+'sent'='aidsent'
'aidsent' is an anagram of 'INSTEAD'.
(Other definitions for instead that I've seen before include "Rather - detains (anag)" , "Alternatively" , "As a substitute" , "for a change" , "use this as a replacement" .)