To 2130: Elusive

Extra letters in clues give the assertion by HOUSMAN (31) that ‘I could no more define poetry than a terrier can define a rat’. In the grid, the definition RENEGADE eludes seven unclued terriers.
 
First prize J.R. Carrington, Denchworth, Oxfordshire
Runners-up Sandra Speak, Dursley, Gloucestershire; Andrew James, Winchester, Hampshire