As used for filing spars, possibly? (5)

I believe the answer is:

rasps

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'as used for filing spars possibly?' is the definition.
I can't judge whether this defines the answer.

'spars possibly?' is the wordplay.
'possibly?' is an anagram indicator (I've seen 'possibly' mean this).
'spars' anagrammed gives 'RASPS'.

Can you help me to learn more?

(Other definitions for rasps that I've seen before include "Coarse files" , "speaks hoarsely" , "Jars" , "Scrapes" , "fruit briefly" .)

I've seen this clue in the Evening Standard.

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