Protecting queen with lackey, use an orderly beyond reproach (7,5)
I believe the answer is:
'beyond reproach' is the definition.
(I've seen this before)
'protecting queen with lackey use an orderly' is the wordplay.
'protecting' means one lot of letters goes inside another (inserted letters are held or protected).
'queen' becomes 'Q' (abbreviation for queen in chess).
'with' means one lot of letters goes inside another.
'use' indicates an anagram (I've seen 'using' mean this (the letters used in a different way)).
'an orderly' becomes 'suean' (I can't explain this - if you can you should give a lot more credence to this answer).
'lackey' with letters rearranged gives 'kyclea'.
'kyclea' placed within 'suean' is 'sueakyclean'.
'q' placed within 'sueakyclean' is 'SQUEAKY-CLEAN'.
Can you help me to learn more?
(Other definitions for squeaky-clean that I've seen before include "Lacking all vice" , "Flawless" , "Whiter than white (like a mouse?)" , "Thoroughly washed (hair)" , "Without vice" .)