School rate suitable for fast work (4-5)
I believe the answer is:
high-speed
'fast work' is the definition.
'high-speed' can be an answer for 'fast' (I've seen this before). I'm unsure of the 'work' bit.
'school rate suitable' is the wordplay.
I cannot really see how this works, but
'school' could be 'high' (high is a kind of school) and 'high' is found within the answer.
'rate' could be 'speed' (speed is a kind of rate) and 'speed' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'for' acts as a link.
Can you help me to learn more?
(Another definition for high-speed that I've seen is " Quick, fast".)