What milliners do, bringing up small ecstasy rush (4,5)
I believe the answer is:
make haste
'rush' is the definition.
(I know that rush can be written as make haste)
'what milliners do bringing up small ecstasy' is the wordplay.
I cannot quite understand how this works, but
'what' could be 'eh' (sound used to ask 'what?' or 'pardon?') and 'eh' is located in the answer.
'small' could be 's' (abbreviation - e.g. clothes size) and 's' is present in the answer.
'ecstasy' could be 'e' (informal term for the drug) and 'e' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for make haste that I've seen before include "Shake mate to hurry up" , "speed" , "Festina lente - . . . . . . . . . slowly" , "Hurry, don't be slow" .)