Fresh letters in support (7)
I believe the answer is:
trestle
'support' is the definition.
(I've seen this before)
'fresh letters' is the wordplay.
'fresh' is an anagram indicator.
'letters' with letters rearranged gives 'TRESTLE'.
'in' acts as a link.
(Other definitions for trestle that I've seen before include "Frame to hold table" , "Braced framework" , "support of growth" , "Wooden frame" , "Braced support" .)