Dog eating left-over pie crust – it follows he’s the guilty party (7)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

A charade of CULPR, an envelope (‘eating’) of L (‘left’-) plus (-‘over’) P (‘ P ie crust’ – but I would have thought that ‘crust’ would indicate both ends) – or you might interpret LP as (‘ L eft-over P ie crust’, which strains ‘crust’ even further) – in CUR (‘dog’); plus (‘follows’) ‘it’.