Multiply it by a hundred thousand here (7)
I believe the answer is:
welcome
'multiply it by a hundred thousand here' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for welcome that I've seen before include "Accept gladly" , "Multiply it by a hundred thousand here" , "vales is delightful!" , "Receive a guest warmly" , "Greetings" .)