Burn letter Sam redirected (9)
I believe the answer is:
streamlet
'burn' is the definition.
(I've seen this before)
'letter sam redirected' is the wordplay.
'redirected' indicates anagramming the letters.
'letter'+'sam'='lettersam'
'lettersam' is an anagram of 'STREAMLET'.
(Other definitions for streamlet that I've seen before include "hardly a river" , "small brook" , "running water" , "Burn" .)