Contributing to aid, we'll save lives (6)
I believe the answer is:
dwells
'lives' is the definition.
('dwell' can be a synonym of 'live')
'contributing to aid we'll save' is the wordplay.
'contributing to' says the answer is hidden in the clue.
'DWELLS' is hidden within 'aid well save'.
(Other definitions for dwells that I've seen before include "Establishes oneself" , "Lives in, inhabits" , "pauses" , "Lodges or resides" .)