Gibbo.....i reckon the occupation is an Excavator..the third letter looks like a d but that is coming down from the word above and it is a c...could be a posh word for a labouring digging trenches etc...not sure on your dates but an excavator today would use a JCB or big digger to move land.
Or a slight chance an excavator could be someone digging up old relics etc...similar to an archeoligist.