### Clue: Sightseers here perhaps inclined to knock back a little drink (4)
### Answer: PISA 
 ### Explanation: Definition: Sightseers here perhaps inclined
 **Reversal of**(to knock back) [A + SIP(a little drink/a bit of liquid taken in)].
Defn:  …, like its leaning tower, perhaps after knocking more than a little drink.