Gamp (8)
I believe the answer is:
umbrella
'gamp' is the definition.
(I know that gamp can be written as umbrella)
This is the entire clue.
(Other definitions for umbrella that I've seen before include "It keeps the raini off" , "Brolly" , "Rain protector" , "requirement in poor weather" , "The old song urges to let a smile be yours" .)