Measure on entertainments infuriates (7)
I believe the answer is:
enrages
'infuriates' is the definition.
(I've seen this in another clue)
'measure on entertainments' is the wordplay.
'measure' becomes 'en' (en is a unit of measurement used by printers).
'on entertainments' becomes 'rages' (I can't justify this - if you can you should give a lot more credence to this answer).
'en'+'rages'='ENRAGES'
Can you help me to learn more?
(Other definitions for enrages that I've seen before include "As green changes it makes one angry" , "Angers" , "Infuriates" , "Makes violently angry" , "Works up" .)