Occupier of temporary shelter outside centre of Gdansk (6)
I believe the answer is:
Here is my best explanation:
'occupier' is the definition.
(tenant is a kind of occupier)
'temporary shelter outside centre of gdansk' is the subsidiary indication.
'temporary shelter' becomes 'tent'.
'outside' means one lot of letters goes inside another.
'centre of' says to take the centre.
The central letters of 'gdansk' are 'an'.
'tent' enclosing 'an' is 'tenant'.
'of' is the link.
(Other definitions for tenant that I've seen before include "Renting occupant", "Occupant of rented property", "One renting property", "Lessee", "One who pays rent", "Person renting property", "One occupying rented property", "Someone who pays rent", "Resident" and "Anne Bronte's novel 'The ...... of Wildfell Hall'".)