Crossword Genius

Noticed a sharp object (3)

Ross

I believe the answer is:

saw

I'm a little stuck... Click here to teach me more about this clue!

'noticed' is the definition.

'a sharp object' is the wordplay.
'a sharp' becomes 'sa' (I can't justify this - if you can you should believe this answer much more).
'object' becomes 'w' (W is an example).
'sa'+'w'='SAW'

Can you help me to learn more?

(Other definitions for saw that I've seen before include "Perceived visually" , "item in tool kit" , "Cutting tool - did 23" , "Carpentry tool" , "Hand tool; proverb" .)

I've seen this clue in The Mirror.
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