assume its the sump hose on a washing machine where it connects to the pump.
if you put the clip back in exactly the same place its more likely to leak as the rubber hose is compressed at that point
take the hose off again, clean it inside then put it back with the clip slightly further forward or back off the original grooves
if you stripped the base off the pump housing (the white part) then yes there should be an o ring that sits around the circumference of the base, if it is still there check it hasn’t been “nipped” up