Possible Clues:

• Might the rover swarm over a French one?
• Too full of cricketing terms
• Jog too much as the invader would do
• Exceed (allowed time/cost)
• Exceed (allowed cost/time)
• 'I shall – these doings before long. I've stood enough of 'em' (George Eliot, Adam Bede)
• Two terms of cricket are too long
• Two cricketing terms for swamp
• Invade conclusively — extend beyond limit
• Go on too long (of a performance)