Obtains a sort of a fortified place (7)
I believe the answer is:
bastion
'a fortified place' is the definition.
(I've seen this before)
'obtains a sort' is the wordplay.
'a sort' is an anagram indicator.
'obtains' anagrammed gives 'BASTION'.
'of' acts as a link.
(Other definitions for bastion that I've seen before include "staunch supporter" , "that's fortified" , "Strong defender" , "Fortified place near hostile territory" , "fortress" .)