If you take away one hand from me, I remain a hand. What am I?

A clock is the answer since removing one 'hand' (either hour or minute hand) still leaves the other, keeping one 'hand' on the clock. This riddle uses the concept of 'hand' in time-telling devices, which differ from the anatomical hand, to interpret an unexpected insight into time and structure. Its cleverness resides in the versatility of English in depicting vastly different contexts for a seemingly specific term.