### Clue: Only one pound in dollars exchanged back (6)
### Answer: DORSAL 
 ### Explanation: Definition: back
 **Anagram of**(… exchanged) "dollars " **minus one of its** "l"(in upper case, standing in for the symbol £ for pound sterling)( Only one pound in …).
Defn: Relating to the back or spinal part of the body of an organism.