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18a. An instrument used fir filling cracks (4)

This seems a difficult one annemarie. The thought lute and (f)lute crossed my mind. lute and flute being instruments and lute is also a stopping or filler but f surely isn't an abbrev for fir. ???

lute2
luːt,ljuːt/Submit
noun
noun: lute; noun: luting
1.
liquid clay or cement used to seal a joint, coat a crucible, or protect a graft.
a rubber seal for a jar.
plural noun: lutes
verb
verb: lute; 3rd person present: lutes; past tense: luted; past participle: luted; gerund or present participle: luting
1.
seal, join, or coat with lute.
"they were luted with a heavy coating of calcined chalk and eggshells"

I think the clue reads - 'For'

Absolutely Mamya!
It was "fir" which I couldn't figure out.

Yes it threw me too.

Thanks .yes should have read for