1d. Central American republic (9). - U - - - - - L -
4d. Famous public school in Somerset (8). - O - - - I - E
12a. Flavour, gusto, piquancy (4). - - - T
18d. Famous public school in Worcestershire (7). - A - V - R -
21d. Famous public school in Warwickshire (5). - U - B -
Thanks in advance.