A little more tummy exposed then? (3-2)
I believe the answer is:
top-up
If this is the answer I cannot explain how the clue works.
Can you help me to learn more?
(Other definitions for top-up that I've seen before include "Extra addition" , "Supplement" , "Replenished drink" , "Additional amount to restore mobile phone credit, for example" , "Amount required to restore something's level" .)