Derbyshire
Need a little help........ 5 Across - Charm exempts mother from historic tax liability **** (4 letters), 10 Across - Are to go around on complex underground system R*O**** (7 letters), 19 Down - Therefore a quantity of work leads to nothing *R*O (4 letters), 22 Across - Headgear that seems to be produced when rain pours down outside **** (4 letters), 20 Across - Frenchman appears with guise that is not to deny responsibility ****G*E (7 letters). Sorry but my brain is not fully functioning today.