Drive or sweep? Somerset's opener lost (4)
I believe the answer is:
urge
'drive' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for urge that I've seen before include "Egg on, encourage to proceed" , "Press to do something" , "Impel, exhort" , "Strong, restless desire" , "Impel - impulse" .)