### Clue: Accept rattle-brained wife replacing husband (7)
### Answer: SWALLOW 
 ### Explanation: Definition: Accept
 "shallow"(rattle-brained;giddy;lacking intellectual depth) **with** "w"(abbrev. for "wife") **replacing** "h"(abbrev. for "husband").
Answer: To believe something without question, as in "she swallowed his excuse", the implication being that that something is untrue.