  We consider a sub-leading twist chiral-odd pion fragmentation function and
explore its contribution in single pion semi-inclusive electroproduction. We
evaluate the single beam-spin azimuthal asymmetry $A_{LU}$ and the double spin
asymmetry $A_{LT}$ in polarized electroproduction of pions from an unpolarized
and transversely polarized nucleon respectively. The beam asymmetry is
expressed as the product of chiral-odd, and $T$-odd and even distribution and
fragmentation functions. The double spin asymmetry contains information on the
quark's transversity distribution. In a quark diquark-spectator framework we
estimate these asymmetries at $6 {\rm GeV}$, $ 12 {\rm GeV}$, and $27.5 {\rm
GeV}$ energies.
