Mum garages a small vehicle — will it run? (7)
I believe the answer is:
'small vehicle will it run?' is the definition.
I can't judge whether this defines the answer.
'mum garages a' is the wordplay.
'mum' becomes 'ma' (synonyms).
'garages' becomes 'scar' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
Can you help me to learn more?
(Other definitions for mascara that I've seen before include "Eyelash darkener" , "could be found in handbag, perhaps" , "Cosmetic for darkening the eyelashes" , "Maracas (anag.)" , "Eyelash make-up" .)