As part of quiet time, cheeky chappies hide from nanny, maybe (9)
I believe the answer is:
parchment
'chappies hide from nanny maybe' is the definition.
I can't judge whether this definition defines the answer.
'as part of quiet time cheeky' is the wordplay.
'as part of' means one lot of letters goes inside another.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'time' becomes 'ment' (I am not sure about this - if you are sure you should believe this answer much more).
'cheeky' becomes 'arch' (I've seen this in another clue).
'p'+'ment'='pment'
'pment' placed around 'arch' is 'PARCHMENT'.
Can you help me to learn more?
(Other definitions for parchment that I've seen before include "Old writing material" , "Work on skin" , "Paper made from animal skin" , "Skin prepared for writing on" , "quality paper" .)