Mechanism

I guess it's not straight Clemmensen reaction or is it?
EDIT: Oops... I have done it earlier.. my friend gave this to me.

Indeed that's Clemmenson reaction..but Tushar needs the mechanism part for this question..

As far I remember.. in this question, there was not just clemmensen.. HCl part of reagent performed different operation in this... damn! I'm struggling to refresh my mind.