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@adroit
first step would be to drill a small (4/5 mm) hole at the end of the crack, to stop it going any further.
That would probably stop it getting worse. If it has been there for ages it will almost certainly slow down the crack spreading, probably for ever.
You might have a seat post that is a bit too small, so when tightening the clamp the tube has had to flex too far.
I guess that should be 27.2 and has a 27.0 (but that is a pure guess!)
A hose clamp won't do anything, unless you want to clamp a hose!