Said, therefore, that the tailor could do it (3)
I believe the answer is:
sew
'the tailor could do it' is the definition.
I can't judge whether this definition defines the answer.
'said therefore' is the wordplay.
'said' shows a homophone (sound like).
'therefore' becomes 'so' ('so' can mean 'consequently' or 'therefore').
'so' sounds like 'SEW'.
'that' is the link.
Can you help me to learn more?
(Other definitions for sew that I've seen before include "Stitch with needle and thread" , "Use a needle and thread" , "Do some needlework" , "Fasten with needle and thread" , "Tack" .)