### Clue: Shady stationer nursing bad back (8)
### Answer: SINISTER 
 ### Explanation: Definition: Shady
 SITER(a station-er/one who puts something or someone in a specified place/station/site, hence site-r) **containing**(nursing) **reversal of**(… back) SIN(an offence against/a bad thing, as in "do good, not bad" – last one to be parsed: not totally sure about using "bad" as a noun).
Defn: …/of doubtful legality/criminal.