Average cost of fashion? (8)
I believe the answer is:
Here is my best explanation:
'average cost of fashion?' is the definition.
'moderate' can be an answer for 'average' (thesaurus). I am not sure about the 'cost of fashion?' bit.
'average cost' is the wordplay.
'average' becomes 'mode' (mode is a kind of average).
'cost' becomes 'rate' (rate is a kind of cost).
(Other definitions for moderate that I've seen before include "Ordinary", "Not extreme - not very good", "Average; not radical", "kept within bounds", "So-so; sensible", "Mild", "not going to extremes", "Make less extreme", "No excessive" and "Average, middle rate".)