Execution
This is an old fashioned bit of legalese. Ignore it.
"execution" in the context used means that the Tenant is promising not to run up debts, get judgements registered againsther and have the Sheriff at the door to "execute" a judgement by seizing her goods. (One also speaks, incidentally, of the guards executing a warrant; and I, being an old fashioned lawyer, occassionally contemplate my expanding waistline, resolve to mend my ways and end up castigating myself that resolution did not proceed to execution)
If a Tenant ends up in such a situation, I imagine that the last thing going through her mind will be
" dear oh dear, and I promised the Landlord I wouldn't let this happen........"