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(Shortened) CONTEXT: [...] GRB060614 is the first nearby long duration GRBclearly not associated to a bright Ib/c supernova. Moreover, its duration(T_{90} ~ 100s) makes it hardly classifiable as a short GRB. It presents strongsimilarities with GRB970228, the prototype of the new class of "fake" shortGRBs that appear to originate from the coalescence of binary neutron stars orwhite dwarfs spiraled out into the galactic halo. AIMS: Within the "canonical"GRB scenario based on the "fireshell" model, we test if GRB060614 can be a"fake" or "disguised" short GRB. [...] METHODS: We fit GRB060614 light curvesin Swift's BAT (15-150keV) and XRT (0.2-10keV) energy bands. Within thefireshell model, light curves are formed by two well defined and differentcomponents: the Proper-GRB (P-GRB), emitted at the fireshell transparency, andthe extended afterglow, due to the interaction between the leftover acceleratedbaryonic and leptonic shell and the CBM. RESULTS: We determine the two freeparameters describing the GRB source within the fireshell model. [...] A smallaverage CBM density [...] is inferred, typical of galactic halos. The firstspikelike emission is identified with the P-GRB and the following prolongedemission with the extended afterglow peak.[...] CONCLUSIONS: The anomalousGRB060614 finds a natural interpretation within our canonical GRB scenario: itis a "disguised" short GRB. [...] This result points to an old binary system,likely formed by a white dwarf and a neutron star, as the progenitor ofGRB060614 and well justify the absence of an associated SN Ib/c. Particularlyimportant for further studies of the final merging process are the temporalstructures in the P-GRB down to 0.1s.

GRB060614: a "fake" short GRB from a merging binary system