Crossword Genius

Help the last assistant (4)

Ross

I believe the answer is:

aide

'assistant' is the definition.
(aide is a kind of assistant)

'help the last' is the wordplay.
'help' becomes 'aid' (synonyms).
'last' indicates one should take the final letters.
The final letter of 'the' is 'e'.
'aid'+'e'='AIDE'

(Other definitions for aide that I've seen before include "Idea (anag)" , "Adviser or assistant" , "Personal assistant in the military" , "auxiliary" , "Somebody helping" .)

I've seen this clue in the Sydney Morning Herald.
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