Fore clipping- (clipping of the initial part): examples- (aero) plane, (cara) van, (tele) phone, (uni) varsity, (earth) quake, (alli) gator.
Back clipping-(end elements are dropped) bike - bicycle, hippo (potamus), lab (oratory), exam (ination), Pram – perambulator, ad (vertisement), gym (nasium), photo (graph) .
Fore and after clipping- (the middle part of the word is retained)
Liz - Elizabeth, (in) flu (enza), (re)fridge (rator).
Ref: IGNOU study guide, In search of Meaning- W. W. Banter, Wiki