Laid up in Dorset resort (6)
I believe the answer is:
'laid up' is the definition.
(I've seen this before)
'dorset resort' is the wordplay.
'resort' is an anagram indicator.
'dorset' is an anagram of 'STORED'.
'in' is the link.
(Other definitions for stored that I've seen before include "Squirrelled away" , "Laid aside for future use" , "Stashed away" , "Saved up in Dorset" , "Warehoused" .)