Ruminate while having moustache waxed outside (4)
I believe the answer is:
chew
'ruminate while' is the definition.
'chew' can be an answer for 'ruminate' (I've seen this before). I'm unsure of the 'while' bit.
'having moustache waxed outside' is the wordplay.
'outside' indicates a hidden word (a word is around or outside the answer).
'CHEW' is hidden in the letters of 'having moustache waxed'.
Can you help me to learn more?
(Other definitions for chew that I've seen before include "Munch" , "bit of tobacco" , "Reflect on" , "Try to eat" , "Work between teeth, masticate" .)