Crossword Genius

Starts in field attacking linseed by sickle-shaped weapon (4)

Ross

I believe the answer is:

falx

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'sickle-shaped weapon' is the definition.
The definition suggests a singular noun which matches the answer.

'starts in field attacking linseed by' is the wordplay.
'starts in' says to take the initial letters.
'by' becomes 'x' (2 by 4 is 2 x 4).
The first letters of 'field attacking linseed' is 'fal'.
'fal'+'x'='FALX'

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