Random inspection to see who has measles? (4,5)
I believe the answer is:
spot check
'random inspection to see who has measles?' is the definition.
'spot check' can be an answer for 'random inspection' (I've seen this before). I'm unsure of the remainder of the definition.
'random inspection to see' is the wordplay.
'random inspection' becomes 'check' (check is a kind of inspection. I am not sure about the 'random' bit.).
'to' means one lot of letters go next to another (I've seen this in other clues).
'see' becomes 'spot' (to spot is to notice or catch sight of).
'check' after 'spot' is 'SPOT-CHECK'.
Can you help me to learn more?
(Other definitions for spot check that I've seen before include "Security measure" , "Random or surprise examination" , "Sudden examination of item chosen at random" , "From impromptu inspection" , "Random test, made without warning" .)