Raft I'd set loose might be this (6)
I believe the answer is:
adrift
'this' is the definition.
Both the answer and definition are adverbs.
Perhaps you can see a link between them that I don't see?
'raft i'd set loose' is the wordplay.
'set loose' indicates an anagram.
'raft'+'id'='raftid'
'raftid' with letters rearranged gives 'ADRIFT'.
'might be' acts as a link.
Can you help me to learn more?
(Other definitions for adrift that I've seen before include "Unsettled or unanchored" , "Floating unattached as at sea" , "Purposeless" , "Loose from moorings" , "'Floating without direction, not tied up (6)'" .)