The first and most obvious answer to this is that it is for the committee to decide what information it requires the clerk to provide and when, although I presume from the way the question is worded that you may not have the unanimous support of the members of the committee in seeking this information. It is difficult to see how a committee might perform its function as custodian of public money without being told how it is being spent. Financial regulation 4.8 of the NALC model states:
4.8. The RFO shall regularly provide the council with a statement of receipts and payments to date under each head of the budgets, comparing actual expenditure to the appropriate date against that planned as shown in the budget. These statements are to be prepared a least at the end of each financial quarter and shall show explanations of material variances. For this purpose “material” shall be in excess of £100 or 15% of the budget.
This may not provide you with exactly what you are seeking, but it's a starting point.
I simply cannot comprehend the attitude of clerks who seek to restrict access to this information. I operate an open door policy, not just for members of my councils, but for parishioners and anybody else who cares to ask. When somebody requests detailed information, I simply ask myself "if this was a Freedom of Information request, would I provide it?" If the answer is yes, I provide it. It's public information about public money.