Slightly staggered at the suggestion that the clerk's working hours dictate the times committee meetings are held. Surely it is a decision of the council when committees take place? Whilst there's no legal reason for meetings to take place in the morning, afternoon or evening (with some limited exceptions), most parish councils hold their meetings in the evening for the very reason you've identified; so that elected Members and members of the public who work can attend. Staffing of those meetings should then be arranged. If that means paying for additional staff time or arranging someone else to take the minutes, so be it.