shop assistant 
noun British
A person who serves customers in a shop.The shop assistant continued to assist Molly, while I looked after Elsie....
- The female shop assistant, who was busy with other customers, showed the rings and another man then buzzed to be allowed in.
- Bosses at the York Dungeon were left scratching their heads after a shop assistant sold a real skull to a customer.
- up to the minute
- up to the (or one's) eyeballs
- up to the (or one's) eyes (in)
- uptown
- uptowner
- uptrend
- upturn
- UPU
- uPVC
- upvote
- upward
- upwardly
- upwardly mobile
- upwardly (or downwardly) mobile
- upward mobility
- upwards
- upwards (or upward) of
- upwarp
- upweight
- upwelling
- upwind
- up with ——
- up your arse!
- up yours
- Ur