Latter year Clemente signatures are very difficult authentications as no two seem to be alike. This one does look very close to what I've seen of his 1970-72 signatures.
I've seen some with unquestionable provenance that aren't only similar to this, but transcend it from a standpoint of penmanship. IMO, all of his signatures, '55 and up are beautiful tracks, but in the last few years, he really seemed to put effort into creating an even more beautiful and florid signature with the emphasis on legibility as well!
Yours is real nice and they don't grow on trees. Clemente is also a particularly devilish forgery for the kitchen table crew so you don't see as many Clemente fakes as others far easier for them to draw.
I'd hold on to this. I think that at some point you'll be very glad that you did.