Chapstick aggravated blip over a large mass (3,4)
I believe the answer is:
lip balm
'chapstick' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I don't see?
'aggravated blip over a large mass' is the wordplay.
'aggravated' is an anagram indicator.
'over' is a charade indicator (letters next to each other).
'large' becomes 'L' (eg in clothes sizes).
'mass' becomes 'm' (symbol used in Physics e.g. f=ma).
'blip' with letters rearranged gives 'lipb'.
'lipb'+'a'+'l'+'m'='LIP BALM'
Can you help me to learn more?
(Other definitions for lip balm that I've seen before include "Salve applied round the mouth" , "Ointment for the kisser" , "Item for chapped facial features?" , "Salve used around the mouth" .)