Another name for a sail that's put up (5)
I believe the answer is:
alias
'another name' is the definition.
(I've seen this in another clue)
'a sail that's put up' is the wordplay.
'that's put up' says the letters should be written backwards.
'sail' in reverse letter order is 'lias'.
'a'+'lias'='ALIAS'
'for' is the link.
(Other definitions for alias that I've seen before include "Otherwise - an assumed name" , "Otherwise known as" , "Otherwise called" , "Pseudonym" , "stage name, perhaps" .)