Spoil cotton clothing while making liqueur (10)
I believe the answer is:
maraschino
'liqueur' is the definition.
(I know that Maraschino is a type of liqueur)
'spoil cotton clothing while' is the wordplay.
'spoil' becomes 'mar' (synonyms).
'cotton' becomes 'chino' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'clothing' is an insertion indicator (some letters cover up or clothe others).
'while' becomes 'as' (eg 'while I walked' means 'as I walked').
'mar'+'chino'='marchino'
'marchino' placed around 'as' is 'MARASCHINO'.
'making' acts as a link.
Can you help me to learn more?
(Another definition for maraschino that I've seen is " Harmonicas (anag) - cherry liqueur".)