Support for a poor settler (7)
I believe the answer is:
trestle
'support' is the definition.
(I've seen this before)
'poor settler' is the wordplay.
'poor' indicates an anagram.
'settler' is an anagram of 'TRESTLE'.
'for a' is the link.
(Other definitions for trestle that I've seen before include "Wooden frame" , "Simple table support" , "horse" , "Letters about a table support" , "Supported (and supporting) board" .)