### Clue: No way! Preposterous one won't face up to reality (7)
### Answer: OSTRICH 
 ### Explanation: Definition: one won't face up to reality
 O(letter representing 0/none/no) ST(abbrev. for "street"/way) + RICH(preposterous/describing, say, a remark, that causes indignation and invites disbelief, as in "that's rich, coming from a non-medical President").
Defn: …, and metaphorically with one's head in the sand.