Random inspection of drunkard outside piano bar (4,5)
I believe the answer is:
spot check
'random inspection' is the definition.
(I've seen this before)
'drunkard outside piano bar' is the wordplay.
I cannot quite see how this works, but
'piano' could be 'p' (musical abbreviation) and 'p' is located in the answer.
'drunkard' could be 'sot' (synonyms) and 'sot' is located in the leftover letters.
The remaining letters 'check' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
'of' is the link.
Can you help me to learn more?
(Other definitions for spot check that I've seen before include "Sudden examination of item chosen at random" , "Unexpected inspection" , "Random or surprise examination" , "Random test, made without warning" , "determining progress of disease?" .)